输入年和月,输出该月有几天。
c++
#include <bits/stdc++.h>
using namespace std;
int main()
{
int y,m;
cin>>y>>m;
switch(m){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
printf("%d",31);break;
case 2:
if(y%4==0&&y%100!=0||y%400==0){
printf("%d",29);break;
}else{
printf("%d",28);break;
}
case 4:
case 6:
case 9:
case 11:
printf("%d",30);break;
}
return 0;
}