改习题2-10

#include <stdio.h>int main(){int a;int b;while(1){printf("请输入年份:");scanf("%d",&a);if(((a%4==0)&&(a%100!=0))||(a%400==0)){printf("该年是闰年\n");printf("请输入月份:");scanf("%d",&b);if((b==2)){printf("该月有29天\n");}if((b==10)||(b==3)||(b==5)||(b==7)||(b==8)||(b==10)||(b==12)){printf("该月有31天\n");}if((b==4)||(b==6)||(b==9)||(b==11)){printf("该月有30天\n");}}else{printf("该年不是闰年\n");printf("请输入月份:");scanf("%d",&b);if((b==2)){printf("该月有28天\n");}if((b==1)||(b==3)||(b==5)||(b==7)||(b==8)||(b==10)||(b==12)){printf("该月有31天\n");}if((b==4)||(b==6)||(b==9)||(b==11)){printf("该月有30天\n");}}}return 0;

}