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< a href = "#func-members" > Functions< / a > < / div >
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< div class = "title" > sol1.c File Reference< / div > < / div >
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< p > < a href = "https://projecteuler.net/problem=16" > Problem 16< / a > solution
< a href = "#details" > More...< / a > < / p >
< div class = "textblock" > < code > #include < math.h> < / code > < br / >
< code > #include < stdint.h> < / code > < br / >
< code > #include < stdio.h> < / code > < br / >
< code > #include < stdlib.h> < / code > < br / >
< / div > < div class = "textblock" > < div class = "dynheader" >
Include dependency graph for sol1.c:< / div >
< div class = "dyncontent" >
< div class = "center" > < iframe scrolling = "no" frameborder = "0" src = "../../dc/d52/problem__16_2sol1_8c__incl.svg" width = "338" height = "127" > < p > < b > This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.< / b > < / p > < / iframe >
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< tr class = "heading" > < td colspan = "2" > < h2 class = "groupheader" > < a name = "func-members" > < / a >
Functions< / h2 > < / td > < / tr >
< tr class = "memitem:a3c04138a5bfe5d72780bb7e82a18e627" > < td class = "memItemLeft" align = "right" valign = "top" > int  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d6/d88/problem__16_2sol1_8c.html#a3c04138a5bfe5d72780bb7e82a18e627" > main< / a > (int argc, char **argv)< / td > < / tr >
< tr class = "separator:a3c04138a5bfe5d72780bb7e82a18e627" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
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< a name = "details" id = "details" > < / a > < h2 class = "groupheader" > Detailed Description< / h2 >
< div class = "textblock" > < p > < a href = "https://projecteuler.net/problem=16" > Problem 16< / a > solution < / p >
< dl class = "section author" > < dt > Author< / dt > < dd > < a href = "https://github.com/kvedala" > Krishna Vedala< / a > < / dd > < / dl >
< / div > < h2 class = "groupheader" > Function Documentation< / h2 >
< a id = "a3c04138a5bfe5d72780bb7e82a18e627" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a3c04138a5bfe5d72780bb7e82a18e627" > ◆ < / a > < / span > main()< / h2 >
< 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 >
< div class = "fragment" > < div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   {< / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > double< / span > tmp = log(10) / log(2); < span class = "comment" > /* required to get number of digits */< / span > < / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "keywordtype" > unsigned< / span > < span class = "keywordtype" > long< / span > MAX_NUM_DIGITS;< / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   uint8_t *digits =< / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   NULL; < span class = "comment" > /* array to store individual digits. index 0 = units place */< / span > < / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < span class = "keywordtype" > int< / span > < a class = "code" href = "../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4" > N< / a > = 1000, sum = 0;< / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < span class = "keywordflow" > if< / span > (argc == 2)< / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < a class = "code" href = "../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4" > N< / a > = atoi(argv[1]);< / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   MAX_NUM_DIGITS = (< a class = "code" href = "../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4" > N< / a > + tmp) / tmp;< / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   digits = calloc(MAX_NUM_DIGITS, < span class = "keyword" > sizeof< / span > (uint8_t));< / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   digits[0] = 1;< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "keywordflow" > if< / span > (!digits)< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   {< / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   perror(< span class = "stringliteral" > " Unable to allocate memory!" < / span > );< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   < span class = "keywordflow" > return< / span > -1;< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   }< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < < a class = "code" href = "../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4" > N< / a > ; i++)< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   {< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "keywordtype" > int< / span > carry = 0;< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > j = 0; j < MAX_NUM_DIGITS; j++)< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   {< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   digits[j] = (digits[j] < < 1) + carry; < span class = "comment" > /* digit * 2 + carry */< / span > < / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   < span class = "comment" > // printf(" \t value: %d\t" , digits[j]);< / span > < / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < span class = "keywordflow" > if< / span > (digits[j] > 9)< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   {< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   carry = 1;< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   digits[j] -= 10;< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   }< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   carry = 0;< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   < span class = "comment" > // printf(" carry: %d\t value: %d\n" , carry, digits[j]);< / span > < / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   < span class = "comment" > /* accumulate sum for last multiplication */< / span > < / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   < span class = "keywordflow" > if< / span > (i == < a class = "code" href = "../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4" > N< / a > - 1)< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   sum += digits[j];< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   }< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   }< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   printf(< span class = "stringliteral" > " 2^%d = " < / span > , < a class = "code" href = "../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4" > N< / a > );< / div >
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< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = MAX_NUM_DIGITS - 1; i > = 0; i--) putchar(digits[i] + 0x30);< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   printf(< span class = "stringliteral" > " \n\t Sum: %d\t Num. digits: %lu\n" < / span > , sum, MAX_NUM_DIGITS);< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   free(digits);< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   }< / div >
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< div class = "ttc" id = "aproblem__13_2sol1_8c_html_a0240ac851181b84ac374872dc5434ee4" > < div class = "ttname" > < a href = "../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4" > N< / a > < / div > < div class = "ttdeci" > #define N< / div > < div class = "ttdef" > < b > Definition:< / b > sol1.c:109< / div > < / div >
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< li class = "navelem" > < a class = "el" href = "../../dir_b3d331eabd4234f247030c297aaf021c.html" > project_euler< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dir_18cba55772148686552805a354a79093.html" > problem_16< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../d6/d88/problem__16_2sol1_8c.html" > sol1.c< / a > < / li >
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