- /*
- 输入某年某月某日,判断这一天是一年中的第几天
- */
- #include <stdio.h>
- #include <conio.h>
- int main (void)
- {
- int day, month, year, sum, leap;
- printf("\n please input year,month,day\n");
- scanf("%d %d %d ",&year,&month,&day);
- switch(month)
- {
- 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;
- if(year%400==0||(year%4==0&&year%100!=0))
- leap=1;
- else
- leap=0;
- if(leap=1&&month>2)
- sum++;
- printf("It is the %dth day.",sum);
- return 0;
- }
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