ch17-16.c

C语言程序设计上机指导与练习 冶金工业出版社 刘怀亮

#include<stdio.h>
main()
{
   int year,month,days;
   printf("Enter year and month: ");
   scanf("%d%d",&year,&month);
   switch(month)
   {
      case 1:
      case 3:
      case 5:
      case 7:
      case 8:
      case 10:
      case 12:days=31;break;
      case 4:
      case 6:
      case 9:
      case 11:days=30;break;
      case 2:
          if(year%4==0&&year%100!=0||year%400==0)
               days=29;
          else
            days=28;
          break;
      default:
           printf("Input error!\n");
   }
   if(days!=0)
      printf("%d,%d is %d days\n",year,month,days);
}