2013年3月算法练习（二） 闰年

#include<iostream>
using namespace std;
int main(int argc,char *argv[])
{
int year,month,days,flag;
cout<<"请输入月份：\n";
cin>>year>>month;
flag=1;
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:
flag=0;
}
if (flag)
{
cout<<"天数："<<days<<endl;
}
else
{
cout<<"不存在的月份"<<endl;
}
system("PAUSE");
return EXIT_SUCCESS;
}