#include "stdio.h" #include "conio.h" int main() { int day,month,year,sum,leap; printf(" please input year,month,day "); scanf("%d,%d,%d",&year,&month,&day); 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=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於2,總天數應該加一天*/ sum++; printf("It is the %dth day.",sum); getchar(); }