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                >[info]計算輸入日期是當年的第幾天 ~~~C #include <stdio.h> int main() { int day,month,year,sum,leap; printf("\n請輸入年、月、日,格式為:年,月,日(2015,12,10)\n"); scanf("%d,%d,%d",&year,&month,&day); // 格式為:2015,12,10 switch(month) // 先計算某月以前月份的總天數 { case 1:sum=0;break; case 2:sum=31;break; case 3:sum=59;break; case 4:sum=90;break; case 5:sum=120;break; case 6:sum=151;break; case 7:sum=181;break; case 8:sum=212;break; case 9:sum=243;break; case 10:sum=273;break; case 11:sum=304;break; case 12:sum=334;break; default:printf("data error");break; } sum+=day; // 再加上某天的天數 if(year%400==0||(year%4==0&&year%100!=0)) {// 判斷是不是閏年 leap=1; } else { leap=0; } if(leap==1&&month>2) { // *如果是閏年且月份大于2,總天數應該加一天 sum++; } printf("這是這一年的第 %d 天。",sum); printf("\n"); return 0; } ~~~
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