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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=19" target = "_blank" > Problem 19< / a > solution
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< a href = "#details" > More...< / a > < / p >
< div class = "textblock" > < code > #include < stdio.h> < / code > < br / >
< / div > < div class = "textblock" > < div class = "dynheader" >
Include dependency graph for sol1.c:< / div >
< div class = "dyncontent" >
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< div class = "center" > < iframe scrolling = "no" frameborder = "0" src = "../../dd/d24/problem__19_2sol1_8c__incl.svg" width = "158" 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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Functions< / h2 > < / td > < / tr >
< tr class = "memitem:ab7f9ad087f124b8e0615aa535b4c8a75" > < td class = "memItemLeft" align = "right" valign = "top" > char  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../dd/df0/problem__19_2sol1_8c.html#ab7f9ad087f124b8e0615aa535b4c8a75" > get_month_days< / a > (short month)< / td > < / tr >
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< tr class = "memdesc:ab7f9ad087f124b8e0615aa535b4c8a75" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Function to get the number of days in a month. < br / > < / td > < / tr >
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< tr class = "separator:ab7f9ad087f124b8e0615aa535b4c8a75" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
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< tr class = "memitem:a6561b1adc8a19c092679b9874da24e2e" > < td class = "memItemLeft" align = "right" valign = "top" > char  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../dd/df0/problem__19_2sol1_8c.html#a6561b1adc8a19c092679b9874da24e2e" > is_leap_year< / a > (short year)< / td > < / tr >
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< tr class = "memdesc:a6561b1adc8a19c092679b9874da24e2e" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Check if input year is a leap year. < br / > < / td > < / tr >
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< tr class = "memdesc:a3c04138a5bfe5d72780bb7e82a18e627" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Main function. < 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=19" target = "_blank" > Problem 19< / a > solution < / p >
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< 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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< / div > < h2 class = "groupheader" > Function Documentation< / h2 >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ab7f9ad087f124b8e0615aa535b4c8a75" > ◆   < / a > < / span > get_month_days()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > char get_month_days < / td >
< td > (< / td >
< td class = "paramtype" > short  < / td >
< td class = "paramname" > < em > month< / em > < / td > < td > )< / td >
< td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
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< p > Function to get the number of days in a month. < / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramname" > month< / td > < td > month identified by an integer -< br / >
< blockquote class = "doxtable" >
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< p > ‍ 0 = Jan and 11 = December < / p >
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< / blockquote >
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< / td > < / tr >
< / table >
< / dd >
< / dl >
< dl class = "section return" > < dt > Returns< / dt > < dd > number of days in given month < / dd > < / dl >
< dl class = "section note" > < dt > Note< / dt > < dd > For February, adjust for leap year outside the function. < / dd > < / dl >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 16< / span > {< / div >
< div class = "line" > < span class = "lineno" > 17< / span > < span class = "keywordflow" > if< / span > (month == 1) < span class = "comment" > /* February has 28 days. Adjust leap year in the loop */< / span > < / div >
< div class = "line" > < span class = "lineno" > 18< / span > < span class = "keywordflow" > return< / span > 28;< / div >
< div class = "line" > < span class = "lineno" > 19< / span > < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (month < = 6) < span class = "comment" > /* odd months till July have 30 days - Jan = 0 (even)*/< / span > < / div >
< div class = "line" > < span class = "lineno" > 20< / span > {< / div >
< div class = "line" > < span class = "lineno" > 21< / span > < span class = "keywordflow" > if< / span > (month & 0x01)< / div >
< div class = "line" > < span class = "lineno" > 22< / span > < span class = "keywordflow" > return< / span > 30;< / div >
< div class = "line" > < span class = "lineno" > 23< / span > < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < span class = "lineno" > 24< / span > < span class = "keywordflow" > return< / span > 31;< / div >
< div class = "line" > < span class = "lineno" > 25< / span > }< / div >
< div class = "line" > < span class = "lineno" > 26< / span > < / div >
< div class = "line" > < span class = "lineno" > 27< / span > < span class = "comment" > // else if (month > = 7) /* odd months after July have 31 days*/< / span > < / div >
< div class = "line" > < span class = "lineno" > 28< / span > < / div >
< div class = "line" > < span class = "lineno" > 29< / span > < span class = "keywordflow" > if< / span > (month & 0x01)< / div >
< div class = "line" > < span class = "lineno" > 30< / span > < span class = "keywordflow" > return< / span > 31;< / div >
< div class = "line" > < span class = "lineno" > 31< / span > < / div >
< div class = "line" > < span class = "lineno" > 32< / span > < span class = "keywordflow" > return< / span > 30;< / div >
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< a id = "a6561b1adc8a19c092679b9874da24e2e" name = "a6561b1adc8a19c092679b9874da24e2e" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a6561b1adc8a19c092679b9874da24e2e" > ◆   < / a > < / span > is_leap_year()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > char is_leap_year < / td >
< td > (< / td >
< td class = "paramtype" > short  < / td >
< td class = "paramname" > < em > year< / em > < / td > < td > )< / td >
< td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Check if input year is a leap year. < / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramname" > year< / td > < td > year to check < / td > < / tr >
< / table >
< / dd >
< / dl >
< dl class = "section return" > < dt > Returns< / dt > < dd > 1 if input year is a leap year < / dd >
< dd >
0 if input year is not a leap year < / dd > < / dl >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 42< / span > {< / div >
< div class = "line" > < span class = "lineno" > 43< / span > < span class = "keywordflow" > if< / span > ((year % 400 == 0) || ((year % 4 == 0) & & (year % 100 != 0)))< / div >
< div class = "line" > < span class = "lineno" > 44< / span > < span class = "keywordflow" > return< / span > 1;< / div >
< div class = "line" > < span class = "lineno" > 45< / span > < / div >
< div class = "line" > < span class = "lineno" > 46< / span > < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < span class = "lineno" > 47< / span > }< / div >
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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" > 80< / span > {< / div >
< div class = "line" > < span class = "lineno" > 81< / span > < span class = "keywordtype" > int< / span > count_sundays = 0;< / div >
< div class = "line" > < span class = "lineno" > 82< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > short< / span > start_year = 1901;< / div >
< div class = "line" > < span class = "lineno" > 83< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > short< / span > end_year = 2000;< / div >
< div class = "line" > < span class = "lineno" > 84< / span > < / div >
< div class = "line" > < span class = "lineno" > 85< / span > < span class = "comment" > /*< / span > < / div >
< div class = "line" > < span class = "lineno" > 86< / span > < span class = "comment" > * Let us identify days i.e., Sunday thru Saturday with integers - 0 thru 6< / span > < / div >
< div class = "line" > < span class = "lineno" > 87< / span > < span class = "comment" > * respectively Jan 1 1901 was a Tuesday< / span > < / div >
< div class = "line" > < span class = "lineno" > 88< / span > < span class = "comment" > */< / span > < / div >
< div class = "line" > < span class = "lineno" > 89< / span > < span class = "keywordtype" > char< / span > start_day = 2;< / div >
< div class = "line" > < span class = "lineno" > 90< / span > < / div >
< div class = "line" > < span class = "lineno" > 91< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > year = start_year; year < = end_year; year++)< / div >
< div class = "line" > < span class = "lineno" > 92< / span > {< / div >
< div class = "line" > < span class = "lineno" > 93< / span > < span class = "keywordtype" > char< / span > is_leap = < a class = "code hl_function" href = "../../dd/df0/problem__19_2sol1_8c.html#a6561b1adc8a19c092679b9874da24e2e" > is_leap_year< / a > (year);< / div >
< div class = "line" > < span class = "lineno" > 94< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > char< / span > month = 0; month < 12; month++)< / div >
< div class = "line" > < span class = "lineno" > 95< / span > {< / div >
< div class = "line" > < span class = "lineno" > 96< / span > < span class = "comment" > /*< / span > < / div >
< div class = "line" > < span class = "lineno" > 97< / span > < span class = "comment" > * These two for-loops count the start of day for the next month.< / span > < / div >
< div class = "line" > < span class = "lineno" > 98< / span > < span class = "comment" > * Hence, we have to skip the last December count< / span > < / div >
< div class = "line" > < span class = "lineno" > 99< / span > < span class = "comment" > */< / span > < / div >
< div class = "line" > < span class = "lineno" > 100< / span > < span class = "keywordflow" > if< / span > (year == end_year & & month == 11)< / div >
< div class = "line" > < span class = "lineno" > 101< / span > < span class = "keywordflow" > continue< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 102< / span > < / div >
< div class = "line" > < span class = "lineno" > 103< / span > < span class = "keywordtype" > int< / span > days = < a class = "code hl_function" href = "../../dd/df0/problem__19_2sol1_8c.html#ab7f9ad087f124b8e0615aa535b4c8a75" > get_month_days< / a > (month);< / div >
< div class = "line" > < span class = "lineno" > 104< / span > < / div >
< div class = "line" > < span class = "lineno" > 105< / span > < span class = "keywordflow" > if< / span > (is_leap & & month == 1) < span class = "comment" > /* for a leap year february, add a day */< / span > < / div >
< div class = "line" > < span class = "lineno" > 106< / span > days++;< / div >
< div class = "line" > < span class = "lineno" > 107< / span > < / div >
< div class = "line" > < span class = "lineno" > 108< / span > < span class = "preprocessor" > #ifdef DEBUG< / span > < / div >
< div class = "line" > < span class = "lineno" > 109< / span > < span class = "keywordflow" > if< / span > (year == end_year)< / div >
< div class = "line" > < span class = "lineno" > 110< / span > {< / div >
< div class = "line" > < span class = "lineno" > 111< / span > printf(< span class = "stringliteral" > " Year: %d\t Month: %d\t Days: %d\t First of day: %s\n" < / span > ,< / div >
< div class = "line" > < span class = "lineno" > 112< / span > year, month, days, day_string(start_day));< / div >
< div class = "line" > < span class = "lineno" > 113< / span > }< / div >
< div class = "line" > < span class = "lineno" > 114< / span > < span class = "preprocessor" > #endif< / span > < / div >
< div class = "line" > < span class = "lineno" > 115< / span > < / div >
< div class = "line" > < span class = "lineno" > 116< / span > < span class = "comment" > /* Main Algorithm:< / span > < / div >
< div class = "line" > < span class = "lineno" > 117< / span > < span class = "comment" > * every week has 7 days hence, the start of next day would be< / span > < / div >
< div class = "line" > < span class = "lineno" > 118< / span > < span class = "comment" > * modulo 7 add to this, the current start date and ensure the< / span > < / div >
< div class = "line" > < span class = "lineno" > 119< / span > < span class = "comment" > * result is still modulo 7!< / span > < / div >
< div class = "line" > < span class = "lineno" > 120< / span > < span class = "comment" > */< / span > < / div >
< div class = "line" > < span class = "lineno" > 121< / span > start_day = ((days % 7) + start_day) % 7;< / div >
< div class = "line" > < span class = "lineno" > 122< / span > < / div >
< div class = "line" > < span class = "lineno" > 123< / span > < span class = "comment" > /* If start-day is a Sunday, increment counter */< / span > < / div >
< div class = "line" > < span class = "lineno" > 124< / span > < span class = "keywordflow" > if< / span > (start_day == 0)< / div >
< div class = "line" > < span class = "lineno" > 125< / span > count_sundays++;< / div >
< div class = "line" > < span class = "lineno" > 126< / span > }< / div >
< div class = "line" > < span class = "lineno" > 127< / span > }< / div >
< div class = "line" > < span class = "lineno" > 128< / span > < / div >
< div class = "line" > < span class = "lineno" > 129< / span > printf(< / div >
< div class = "line" > < span class = "lineno" > 130< / span > < span class = "stringliteral" > " Total number of Sundays that happened on the 1st of a month in the " < / span > < / div >
< div class = "line" > < span class = "lineno" > 131< / span > < span class = "stringliteral" > " last century: %d\n" < / span > ,< / div >
< div class = "line" > < span class = "lineno" > 132< / span > count_sundays);< / div >
< div class = "line" > < span class = "lineno" > 133< / span > < / div >
< div class = "line" > < span class = "lineno" > 134< / span > < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < span class = "lineno" > 135< / span > }< / div >
2021-10-26 03:34:27 +08:00
< div class = "ttc" id = "aproblem__19_2sol1_8c_html_a6561b1adc8a19c092679b9874da24e2e" > < div class = "ttname" > < a href = "../../dd/df0/problem__19_2sol1_8c.html#a6561b1adc8a19c092679b9874da24e2e" > is_leap_year< / a > < / div > < div class = "ttdeci" > char is_leap_year(short year)< / div > < div class = "ttdoc" > Check if input year is a leap year.< / div > < div class = "ttdef" > < b > Definition:< / b > sol1.c:41< / div > < / div >
< div class = "ttc" id = "aproblem__19_2sol1_8c_html_ab7f9ad087f124b8e0615aa535b4c8a75" > < div class = "ttname" > < a href = "../../dd/df0/problem__19_2sol1_8c.html#ab7f9ad087f124b8e0615aa535b4c8a75" > get_month_days< / a > < / div > < div class = "ttdeci" > char get_month_days(short month)< / div > < div class = "ttdoc" > Function to get the number of days in a month.< / div > < div class = "ttdef" > < b > Definition:< / b > sol1.c:15< / 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 = "../../dd/df0/problem__19_2sol1_8c_a3c04138a5bfe5d72780bb7e82a18e627_cgraph.svg" width = "228" height = "86" > < 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 >
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< / div >
< / div >
< / div > <!-- contents -->
< / div > <!-- doc - content -->
<!-- start footer part -->
< div id = "nav-path" class = "navpath" > <!-- id is needed for treeview function! -->
< ul >
< li class = "navelem" > < a class = "el" href = "../../dir_b3d331eabd4234f247030c297aaf021c.html" > project_euler< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dir_0bc3e2a5baf077fa21dadc079776fcac.html" > problem_19< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dd/df0/problem__19_2sol1_8c.html" > sol1.c< / a > < / li >
2023-01-21 05:44:50 +08:00
< li class = "footer" > Generated by < a href = "https://www.doxygen.org/index.html" > < img class = "footer" src = "../../doxygen.svg" width = "104" height = "31" alt = "doxygen" / > < / a > 1.9.6 < / li >
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< / ul >
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