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< a href = "#nested-classes" > Data Structures< / a > |
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< div class = "headertitle" > < div class = "title" > sol1.c File Reference< / div > < / div >
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< p > < a href = "https://projecteuler.net/problem=20" target = "_blank" > Problem 20< / a > solution
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< a href = "#details" > More...< / a > < / p >
< div class = "textblock" > < code > #include < stdio.h> < / code > < br / >
< code > #include < stdlib.h> < / code > < br / >
< code > #include < time.h> < / code > < br / >
< / div > < div class = "textblock" > < div class = "dynheader" >
Include dependency graph for sol1.c:< / div >
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< div class = "center" > < iframe scrolling = "no" frameborder = "0" src = "../../d9/d7e/problem__20_2sol1_8c__incl.svg" width = "243" height = "124" > < p > < b > This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.< / b > < / p > < / iframe >
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< / div > < table class = "memberdecls" >
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Data Structures< / h2 > < / td > < / tr >
< tr class = "memitem:" > < td class = "memItemLeft" align = "right" valign = "top" > struct   < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../dc/d77/struct__big__int.html" > _big_int< / a > < / td > < / tr >
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< tr class = "memdesc:" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > store arbitratily large integer values as a linked list of digits. < a href = "../../dc/d77/struct__big__int.html#details" > More...< / a > < br / > < / td > < / tr >
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< tr class = "separator:" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< / table > < table class = "memberdecls" >
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Typedefs< / h2 > < / td > < / tr >
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typedef struct < a class = "el" href = "../../dc/d77/struct__big__int.html" > _big_int< / a >   < / td > < td class = "memItemRight" valign = "bottom" > < b > big_int< / b > < / td > < / tr >
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< tr class = "memdesc:a62cbbd106aad52daadb9403a07d0da32" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > store arbitratily large integer values as a linked list of digits. < br / > < / td > < / tr >
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Functions< / h2 > < / td > < / tr >
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< tr class = "memitem:a0dd8af03e6cc8187e996db564ff90960" > < td class = "memItemLeft" align = "right" valign = "top" > < a class = "el" href = "../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32" > big_int< / a > *  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../db/d80/problem__20_2sol1_8c.html#a0dd8af03e6cc8187e996db564ff90960" > add_digit< / a > (< a class = "el" href = "../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32" > big_int< / a > *digit, char value)< / td > < / tr >
< tr class = "memdesc:a0dd8af03e6cc8187e996db564ff90960" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Function that allocates memory to add another digit at the MSB. < a href = "../../db/d80/problem__20_2sol1_8c.html#a0dd8af03e6cc8187e996db564ff90960" > More...< / a > < br / > < / td > < / tr >
< tr class = "separator:a0dd8af03e6cc8187e996db564ff90960" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:a54a02c4b963fdb16f24959e0137763f1" > < td class = "memItemLeft" align = "right" valign = "top" > char  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1" > remove_digits< / a > (< a class = "el" href = "../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32" > big_int< / a > *digit, int N)< / td > < / tr >
< tr class = "memdesc:a54a02c4b963fdb16f24959e0137763f1" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Function to remove digits preceeding the current digit. < a href = "../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1" > More...< / a > < br / > < / td > < / tr >
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< tr class = "separator:a54a02c4b963fdb16f24959e0137763f1" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
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< tr class = "memitem:a3c04138a5bfe5d72780bb7e82a18e627" > < td class = "memItemLeft" align = "right" valign = "top" > int  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../db/d80/problem__20_2sol1_8c.html#a3c04138a5bfe5d72780bb7e82a18e627" > main< / a > (int argc, char **argv)< / td > < / tr >
< tr class = "memdesc:a3c04138a5bfe5d72780bb7e82a18e627" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Main function. < a href = "../../db/d80/problem__20_2sol1_8c.html#a3c04138a5bfe5d72780bb7e82a18e627" > More...< / a > < br / > < / td > < / tr >
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< / table >
< a name = "details" id = "details" > < / a > < h2 class = "groupheader" > Detailed Description< / h2 >
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< div class = "textblock" > < p > < a href = "https://projecteuler.net/problem=20" target = "_blank" > Problem 20< / a > solution < / p >
< dl class = "section author" > < dt > Author< / dt > < dd > < a href = "https://github.com/kvedala" target = "_blank" > Krishna Vedala< / a > < / dd > < / dl >
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< p > Implementation uses a custom < code > big_int< / code > structure that can store arbitrarily large integer numbers. < / p >
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< / div > < h2 class = "groupheader" > Function Documentation< / h2 >
< a id = "a0dd8af03e6cc8187e996db564ff90960" name = "a0dd8af03e6cc8187e996db564ff90960" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a0dd8af03e6cc8187e996db564ff90960" > ◆   < / a > < / span > add_digit()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > < a class = "el" href = "../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32" > big_int< / a > * add_digit < / td >
< td > (< / td >
< td class = "paramtype" > < a class = "el" href = "../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32" > big_int< / a > *  < / td >
< td class = "paramname" > < em > digit< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > char  < / td >
< td class = "paramname" > < em > value< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Function that allocates memory to add another digit at the MSB. < / p >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 38< / span > {< / div >
< div class = "line" > < span class = "lineno" > 39< / span > < span class = "keywordflow" > if< / span > (digit == NULL)< / div >
< div class = "line" > < span class = "lineno" > 40< / span > {< / div >
< div class = "line" > < span class = "lineno" > 41< / span > digit = (< a class = "code hl_struct" href = "../../dc/d77/struct__big__int.html" > big_int< / a > *)< a class = "code hl_define" href = "../../d2/ddd/malloc__dbg_8h.html#a725f50ecaf1959d96de79b36b4788fee" > malloc< / a > (< span class = "keyword" > sizeof< / span > (< a class = "code hl_struct" href = "../../dc/d77/struct__big__int.html" > big_int< / a > ));< / div >
< div class = "line" > < span class = "lineno" > 42< / span > < span class = "keywordflow" > if< / span > (!digit)< / div >
< div class = "line" > < span class = "lineno" > 43< / span > {< / div >
< div class = "line" > < span class = "lineno" > 44< / span > perror(< span class = "stringliteral" > " Unable to allocate memory!" < / span > );< / div >
< div class = "line" > < span class = "lineno" > 45< / span > < span class = "keywordflow" > return< / span > NULL;< / div >
< div class = "line" > < span class = "lineno" > 46< / span > }< / div >
< div class = "line" > < span class = "lineno" > 47< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a273ee73fd755f2a99512cca5f0e09008" > value< / a > = value;< / div >
< div class = "line" > < span class = "lineno" > 48< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > = NULL;< / div >
< div class = "line" > < span class = "lineno" > 49< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#ad8405989a924410942b39ec0e9fef30b" > prev_digit< / a > = NULL;< / div >
< div class = "line" > < span class = "lineno" > 50< / span > < / div >
< div class = "line" > < span class = "lineno" > 51< / span > < span class = "keywordflow" > return< / span > digit;< / div >
< div class = "line" > < span class = "lineno" > 52< / span > }< / div >
< div class = "line" > < span class = "lineno" > 53< / span > < / div >
< div class = "line" > < span class = "lineno" > 54< / span > < span class = "keywordflow" > if< / span > (digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > )< / div >
< div class = "line" > < span class = "lineno" > 55< / span > {< / div >
< div class = "line" > < span class = "lineno" > 56< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > -> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a273ee73fd755f2a99512cca5f0e09008" > value< / a > = value;< / div >
< div class = "line" > < span class = "lineno" > 57< / span > < span class = "keywordflow" > return< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > ;< / div >
< div class = "line" > < span class = "lineno" > 58< / span > }< / div >
< div class = "line" > < span class = "lineno" > 59< / span > < / div >
< div class = "line" > < span class = "lineno" > 60< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > = (< a class = "code hl_struct" href = "../../dc/d77/struct__big__int.html" > big_int< / a > *)< a class = "code hl_define" href = "../../d2/ddd/malloc__dbg_8h.html#a725f50ecaf1959d96de79b36b4788fee" > malloc< / a > (< span class = "keyword" > sizeof< / span > (< a class = "code hl_struct" href = "../../dc/d77/struct__big__int.html" > big_int< / a > ));< / div >
< div class = "line" > < span class = "lineno" > 61< / span > < span class = "keywordflow" > if< / span > (digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > == NULL)< / div >
< div class = "line" > < span class = "lineno" > 62< / span > {< / div >
< div class = "line" > < span class = "lineno" > 63< / span > perror(< span class = "stringliteral" > " Unable to allocate memory!" < / span > );< / div >
< div class = "line" > < span class = "lineno" > 64< / span > < span class = "keywordflow" > return< / span > NULL;< / div >
< div class = "line" > < span class = "lineno" > 65< / span > }< / div >
< div class = "line" > < span class = "lineno" > 66< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > -> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a273ee73fd755f2a99512cca5f0e09008" > value< / a > = value;< / div >
< div class = "line" > < span class = "lineno" > 67< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > -> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > = NULL;< / div >
< div class = "line" > < span class = "lineno" > 68< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > -> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#ad8405989a924410942b39ec0e9fef30b" > prev_digit< / a > = digit;< / div >
< div class = "line" > < span class = "lineno" > 69< / span > < span class = "keywordflow" > return< / span > digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > ;< / div >
< div class = "line" > < span class = "lineno" > 70< / span > }< / div >
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< div class = "ttc" id = "amalloc__dbg_8h_html_a725f50ecaf1959d96de79b36b4788fee" > < div class = "ttname" > < a href = "../../d2/ddd/malloc__dbg_8h.html#a725f50ecaf1959d96de79b36b4788fee" > malloc< / a > < / div > < div class = "ttdeci" > #define malloc(bytes)< / div > < div class = "ttdoc" > This macro replace the standard malloc function with malloc_dbg.< / div > < div class = "ttdef" > < b > Definition:< / b > malloc_dbg.h:18< / div > < / div >
< div class = "ttc" id = "astruct__big__int_html" > < div class = "ttname" > < a href = "../../dc/d77/struct__big__int.html" > _big_int< / a > < / div > < div class = "ttdoc" > store arbitratily large integer values as a linked list of digits.< / div > < div class = "ttdef" > < b > Definition:< / b > sol1.c:18< / div > < / div >
< div class = "ttc" id = "astruct__big__int_html_a187538b984c86d7cfdb13e297e7f3564" > < div class = "ttname" > < a href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > _big_int::next_digit< / a > < / div > < div class = "ttdeci" > struct _big_int * next_digit< / div > < div class = "ttdoc" > hundreds place< / div > < div class = "ttdef" > < b > Definition:< / b > sol1.c:20< / div > < / div >
< div class = "ttc" id = "astruct__big__int_html_a273ee73fd755f2a99512cca5f0e09008" > < div class = "ttname" > < a href = "../../dc/d77/struct__big__int.html#a273ee73fd755f2a99512cca5f0e09008" > _big_int::value< / a > < / div > < div class = "ttdeci" > char value< / div > < div class = "ttdoc" > tens place (single digit)< / div > < div class = "ttdef" > < b > Definition:< / b > sol1.c:19< / div > < / div >
< div class = "ttc" id = "astruct__big__int_html_ad8405989a924410942b39ec0e9fef30b" > < div class = "ttname" > < a href = "../../dc/d77/struct__big__int.html#ad8405989a924410942b39ec0e9fef30b" > _big_int::prev_digit< / a > < / div > < div class = "ttdeci" > struct _big_int * prev_digit< / div > < div class = "ttdoc" > units place< / div > < div class = "ttdef" > < b > Definition:< / b > sol1.c:21< / div > < / div >
< / div > <!-- fragment -->
< / div >
< / div >
< a id = "a3c04138a5bfe5d72780bb7e82a18e627" name = "a3c04138a5bfe5d72780bb7e82a18e627" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a3c04138a5bfe5d72780bb7e82a18e627" > ◆   < / a > < / span > main()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > int main < / td >
< td > (< / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > argc< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > char **  < / td >
< td class = "paramname" > < em > argv< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Main function. < / p >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 96< / span > {< / div >
< div class = "line" > < span class = "lineno" > 97< / span > < span class = "keywordtype" > unsigned< / span > < span class = "keywordtype" > int< / span > N = 5;< / div >
< div class = "line" > < span class = "lineno" > 98< / span > < a class = "code hl_struct" href = "../../dc/d77/struct__big__int.html" > big_int< / a > *ptr = < a class = "code hl_function" href = "../../db/d80/problem__20_2sol1_8c.html#a0dd8af03e6cc8187e996db564ff90960" > add_digit< / a > (NULL, 1); < span class = "comment" > /* start with 1 */< / span > < / div >
< div class = "line" > < span class = "lineno" > 99< / span > < span class = "keyword" > const< / span > < a class = "code hl_struct" href = "../../dc/d77/struct__big__int.html" > big_int< / a > *ptr0 = ptr; < span class = "comment" > /* save the first location */< / span > < / div >
< div class = "line" > < span class = "lineno" > 100< / span > < span class = "keywordtype" > unsigned< / span > < span class = "keywordtype" > long< / span > sum_digits = 0;< / div >
< div class = "line" > < span class = "lineno" > 101< / span > < span class = "keywordtype" > unsigned< / span > < span class = "keywordtype" > long< / span > num_digits = 0;< / div >
< div class = "line" > < span class = "lineno" > 102< / span > < / div >
< div class = "line" > < span class = "lineno" > 103< / span > < span class = "keywordflow" > if< / span > (argc == 2)< / div >
< div class = "line" > < span class = "lineno" > 104< / span > N = atoi(argv[1]);< / div >
< div class = "line" > < span class = "lineno" > 105< / span > < / div >
< div class = "line" > < span class = "lineno" > 106< / span > clock_t start_time = clock();< / div >
< div class = "line" > < span class = "lineno" > 107< / span > < / div >
< div class = "line" > < span class = "lineno" > 108< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > unsigned< / span > < span class = "keywordtype" > int< / span > i = 1; i < = N; i++)< / div >
< div class = "line" > < span class = "lineno" > 109< / span > {< / div >
< div class = "line" > < span class = "lineno" > 110< / span > < span class = "keywordtype" > int< / span > carry = 0;< / div >
< div class = "line" > < span class = "lineno" > 111< / span > < span class = "preprocessor" > #ifdef DEBUG< / span > < / div >
< div class = "line" > < span class = "lineno" > 112< / span > printf(< span class = "stringliteral" > " %3d: " < / span > , i);< / div >
< div class = "line" > < span class = "lineno" > 113< / span > < span class = "preprocessor" > #endif< / span > < / div >
< div class = "line" > < span class = "lineno" > 114< / span > ptr = (< a class = "code hl_struct" href = "../../dc/d77/struct__big__int.html" > big_int< / a > *)ptr0; < span class = "comment" > /* multiply every digit with i */< / span > < / div >
< div class = "line" > < span class = "lineno" > 115< / span > < span class = "keywordflow" > while< / span > (ptr)< / div >
< div class = "line" > < span class = "lineno" > 116< / span > {< / div >
< div class = "line" > < span class = "lineno" > 117< / span > < span class = "preprocessor" > #ifdef DEBUG< / span > < / div >
< div class = "line" > < span class = "lineno" > 118< / span > printf(< span class = "stringliteral" > " %p\t" < / span > , ptr);< / div >
< div class = "line" > < span class = "lineno" > 119< / span > < span class = "preprocessor" > #endif< / span > < / div >
< div class = "line" > < span class = "lineno" > 120< / span > < span class = "keywordtype" > unsigned< / span > < span class = "keywordtype" > int< / span > tmp = ptr-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a273ee73fd755f2a99512cca5f0e09008" > value< / a > * i + carry;< / div >
< div class = "line" > < span class = "lineno" > 121< / span > < span class = "keywordflow" > if< / span > (tmp > = 10)< / div >
< div class = "line" > < span class = "lineno" > 122< / span > {< / div >
< div class = "line" > < span class = "lineno" > 123< / span > div_t tmp2 = div(tmp, 10);< / div >
< div class = "line" > < span class = "lineno" > 124< / span > carry = tmp2.quot;< / div >
< div class = "line" > < span class = "lineno" > 125< / span > tmp = tmp2.rem;< / div >
< div class = "line" > < span class = "lineno" > 126< / span > }< / div >
< div class = "line" > < span class = "lineno" > 127< / span > < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < span class = "lineno" > 128< / span > carry = 0;< / div >
< div class = "line" > < span class = "lineno" > 129< / span > < / div >
< div class = "line" > < span class = "lineno" > 130< / span > < span class = "keywordflow" > if< / span > (carry > 0 & & ptr-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > == NULL)< / div >
< div class = "line" > < span class = "lineno" > 131< / span > < a class = "code hl_function" href = "../../db/d80/problem__20_2sol1_8c.html#a0dd8af03e6cc8187e996db564ff90960" > add_digit< / a > (ptr, 0);< / div >
< div class = "line" > < span class = "lineno" > 132< / span > < / div >
< div class = "line" > < span class = "lineno" > 133< / span > ptr-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a273ee73fd755f2a99512cca5f0e09008" > value< / a > = tmp;< / div >
< div class = "line" > < span class = "lineno" > 134< / span > < / div >
< div class = "line" > < span class = "lineno" > 135< / span > < span class = "keywordflow" > if< / span > (i == N)< / div >
< div class = "line" > < span class = "lineno" > 136< / span > < span class = "comment" > /*< / span > < / div >
< div class = "line" > < span class = "lineno" > 137< / span > < span class = "comment" > * sum digits on the last iteration< / span > < / div >
< div class = "line" > < span class = "lineno" > 138< / span > < span class = "comment" > * this avoid having another loop over all digits< / span > < / div >
< div class = "line" > < span class = "lineno" > 139< / span > < span class = "comment" > */< / span > < / div >
< div class = "line" > < span class = "lineno" > 140< / span > sum_digits += tmp;< / div >
< div class = "line" > < span class = "lineno" > 141< / span > < / div >
< div class = "line" > < span class = "lineno" > 142< / span > < span class = "keywordflow" > if< / span > (ptr-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > )< / div >
< div class = "line" > < span class = "lineno" > 143< / span > < span class = "comment" > /* more digits available */< / span > < / div >
< div class = "line" > < span class = "lineno" > 144< / span > ptr = ptr-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > ;< / div >
< div class = "line" > < span class = "lineno" > 145< / span > < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < span class = "lineno" > 146< / span > < span class = "comment" > /* no more digits left - reached MSB */< / span > < / div >
< div class = "line" > < span class = "lineno" > 147< / span > < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 148< / span > }< / div >
< div class = "line" > < span class = "lineno" > 149< / span > < span class = "preprocessor" > #ifdef DEBUG< / span > < / div >
< div class = "line" > < span class = "lineno" > 150< / span > printf(< span class = "stringliteral" > " \n" < / span > );< / div >
< div class = "line" > < span class = "lineno" > 151< / span > < span class = "preprocessor" > #endif< / span > < / div >
< div class = "line" > < span class = "lineno" > 152< / span > }< / div >
< div class = "line" > < span class = "lineno" > 153< / span > < / div >
< div class = "line" > < span class = "lineno" > 154< / span > clock_t end_time = clock();< / div >
< div class = "line" > < span class = "lineno" > 155< / span > < / div >
< div class = "line" > < span class = "lineno" > 156< / span > < span class = "preprocessor" > #ifdef DEBUG< / span > < / div >
< div class = "line" > < span class = "lineno" > 157< / span > printf(< span class = "stringliteral" > " ptr = %p\n" < / span > , ptr);< / div >
< div class = "line" > < span class = "lineno" > 158< / span > printf(< span class = "stringliteral" > " %d! = " < / span > , N);< / div >
< div class = "line" > < span class = "lineno" > 159< / span > < span class = "preprocessor" > #endif< / span > < / div >
< div class = "line" > < span class = "lineno" > 160< / span > < / div >
< div class = "line" > < span class = "lineno" > 161< / span > < span class = "comment" > /* Notice that in the loop above, we make sure that at the end of the loop,< / span > < / div >
< div class = "line" > < span class = "lineno" > 162< / span > < span class = "comment" > * ptr is pointing to the last digit. Thus we can avoid using another loop.< / span > < / div >
< div class = "line" > < span class = "lineno" > 163< / span > < span class = "comment" > */< / span > < / div >
< div class = "line" > < span class = "lineno" > 164< / span > < span class = "comment" > // ptr = & my_int;< / span > < / div >
< div class = "line" > < span class = "lineno" > 165< / span > < span class = "comment" > // /* move ptr to the MSB digit */< / span > < / div >
< div class = "line" > < span class = "lineno" > 166< / span > < span class = "comment" > // while (ptr-> next_digit)< / span > < / div >
< div class = "line" > < span class = "lineno" > 167< / span > < span class = "comment" > // ptr = ptr-> next_digit;< / span > < / div >
< div class = "line" > < span class = "lineno" > 168< / span > < span class = "keywordflow" > do< / span > < / div >
< div class = "line" > < span class = "lineno" > 169< / span > {< / div >
< div class = "line" > < span class = "lineno" > 170< / span > putchar(ptr-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a273ee73fd755f2a99512cca5f0e09008" > value< / a > + 0x30); < span class = "comment" > /* convert digit to ASCII char */< / span > < / div >
< div class = "line" > < span class = "lineno" > 171< / span > ptr = ptr-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#ad8405989a924410942b39ec0e9fef30b" > prev_digit< / a > ;< / div >
< div class = "line" > < span class = "lineno" > 172< / span > num_digits++;< / div >
< div class = "line" > < span class = "lineno" > 173< / span > } < span class = "keywordflow" > while< / span > (ptr); < span class = "comment" > /* after coming to units place, there will be no valid ptr */< / span > < / div >
< div class = "line" > < span class = "lineno" > 174< / span > < / div >
< div class = "line" > < span class = "lineno" > 175< / span > printf(< span class = "stringliteral" > " \nTime taken: %.4g millisecond\n" < / span > ,< / div >
< div class = "line" > < span class = "lineno" > 176< / span > 1e3 * (end_time - start_time) / CLOCKS_PER_SEC);< / div >
< div class = "line" > < span class = "lineno" > 177< / span > printf(< / div >
< div class = "line" > < span class = "lineno" > 178< / span > < span class = "stringliteral" > " Digit Sum = %lu\tNumber of digits = %lu\tStorage space = %.3gkb\t \n" < / span > ,< / div >
< div class = "line" > < span class = "lineno" > 179< / span > sum_digits, num_digits, num_digits * < span class = "keyword" > sizeof< / span > (< a class = "code hl_struct" href = "../../dc/d77/struct__big__int.html" > big_int< / a > ) / 1024.0);< / div >
< div class = "line" > < span class = "lineno" > 180< / span > < / div >
< div class = "line" > < span class = "lineno" > 181< / span > < a class = "code hl_function" href = "../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1" > remove_digits< / a > ((< a class = "code hl_struct" href = "../../dc/d77/struct__big__int.html" > big_int< / a > *)ptr0, -1);< / div >
< div class = "line" > < span class = "lineno" > 182< / span > < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < span class = "lineno" > 183< / span > }< / div >
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< div class = "ttc" id = "aproblem__20_2sol1_8c_html_a0dd8af03e6cc8187e996db564ff90960" > < div class = "ttname" > < a href = "../../db/d80/problem__20_2sol1_8c.html#a0dd8af03e6cc8187e996db564ff90960" > add_digit< / a > < / div > < div class = "ttdeci" > big_int * add_digit(big_int *digit, char value)< / div > < div class = "ttdoc" > Function that allocates memory to add another digit at the MSB.< / div > < div class = "ttdef" > < b > Definition:< / b > sol1.c:37< / div > < / div >
< div class = "ttc" id = "aproblem__20_2sol1_8c_html_a54a02c4b963fdb16f24959e0137763f1" > < div class = "ttname" > < a href = "../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1" > remove_digits< / a > < / div > < div class = "ttdeci" > char remove_digits(big_int *digit, int N)< / div > < div class = "ttdoc" > Function to remove digits preceeding the current digit.< / div > < div class = "ttdef" > < b > Definition:< / b > sol1.c:76< / div > < / div >
< / div > <!-- fragment --> < div class = "dynheader" >
Here is the call graph for this function:< / div >
< div class = "dyncontent" >
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< div class = "center" > < iframe scrolling = "no" frameborder = "0" src = "../../db/d80/problem__20_2sol1_8c_a3c04138a5bfe5d72780bb7e82a18e627_cgraph.svg" width = "212" height = "110" > < p > < b > This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.< / b > < / p > < / iframe >
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< / div >
< / div >
< / div >
< / div >
< a id = "a54a02c4b963fdb16f24959e0137763f1" name = "a54a02c4b963fdb16f24959e0137763f1" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a54a02c4b963fdb16f24959e0137763f1" > ◆   < / a > < / span > remove_digits()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > char remove_digits < / td >
< td > (< / td >
< td class = "paramtype" > < a class = "el" href = "../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32" > big_int< / a > *  < / td >
< td class = "paramname" > < em > digit< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > N< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Function to remove digits preceeding the current digit. < / p >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 77< / span > {< / div >
< div class = "line" > < span class = "lineno" > 78< / span > < span class = "keywordflow" > if< / span > (digit == NULL)< / div >
< div class = "line" > < span class = "lineno" > 79< / span > < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < span class = "lineno" > 80< / span > < / div >
< div class = "line" > < span class = "lineno" > 81< / span > < span class = "keywordflow" > if< / span > (digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > == NULL)< / div >
< div class = "line" > < span class = "lineno" > 82< / span > {< / div >
< div class = "line" > < span class = "lineno" > 83< / span > < a class = "code hl_define" href = "../../d2/ddd/malloc__dbg_8h.html#a9cc854374299a1dd933bf62029761768" > free< / a > (digit);< / div >
< div class = "line" > < span class = "lineno" > 84< / span > digit = NULL;< / div >
< div class = "line" > < span class = "lineno" > 85< / span > < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < span class = "lineno" > 86< / span > }< / div >
< div class = "line" > < span class = "lineno" > 87< / span > < / div >
< div class = "line" > < span class = "lineno" > 88< / span > < span class = "keywordflow" > if< / span > (N > 0)< / div >
< div class = "line" > < span class = "lineno" > 89< / span > < span class = "keywordflow" > return< / span > < a class = "code hl_function" href = "../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1" > remove_digits< / a > (digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > , N - 1);< / div >
< div class = "line" > < span class = "lineno" > 90< / span > < / div >
< div class = "line" > < span class = "lineno" > 91< / span > < span class = "keywordflow" > return< / span > < a class = "code hl_function" href = "../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1" > remove_digits< / a > (digit-> < a class = "code hl_variable" href = "../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564" > next_digit< / a > , 0);< / div >
< div class = "line" > < span class = "lineno" > 92< / span > }< / div >
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< div class = "ttc" id = "amalloc__dbg_8h_html_a9cc854374299a1dd933bf62029761768" > < div class = "ttname" > < a href = "../../d2/ddd/malloc__dbg_8h.html#a9cc854374299a1dd933bf62029761768" > free< / a > < / div > < div class = "ttdeci" > #define free(ptr)< / div > < div class = "ttdoc" > This macro replace the standard free function with free_dbg.< / div > < div class = "ttdef" > < b > Definition:< / b > malloc_dbg.h:26< / div > < / div >
< / div > <!-- fragment --> < div class = "dynheader" >
Here is the call graph for this function:< / div >
< div class = "dyncontent" >
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