#include "iostream.h"
int main()
{
    int a,b,c;
    char aper,count;
    cout<<"输入日期(如:2005-2-8):";
    cin>>a>>aper>>b>>count>>c;
    cout<<a<<aper<<b<<count<<c<<endl;
    switch ((a+3)/4-a/4&&(a/400+3)-a/400&&(a+399)/400-a/400)
    {
    case 0:
        if(b==1&&c&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c<<"天!"<<endl;
        else
        {
            if(b==2&&c<=29) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+31<<"天!"<<endl;
            else
            {
                if(b==3&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+60<<"天!"<<endl;
                else
                {
                    if(b==4&&c<=30) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+91<<"天!"<<endl;
                    else
                    {
                        if(b==5&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+121<<"天!"<<endl;
                        else
                        {
                            if(b==6&&c<=30) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+152<<"天!"<<endl;
                            else
                            {
                                if(b==7&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+182<<"天!"<<endl;
                                else
                                {
                                    if(b==8&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+213<<"天!"<<endl;
                                    else
                                    {
                                        if(b==9&&c<=30) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+244<<"天!"<<endl;
                                        else
                                        {
                                            if(b==10&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+274<<"天!"<<endl;
                                            else
                                            {
                                                if(b==11&&c<=30) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+305<<"天!"<<endl;
                                                else
                                                {
                                                    if(b==12&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是闰年"<<a<<"年的第"<<c+335<<"天!"<<endl;
                                                    else cout<<"错误日期!"<<endl;
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        break;
    case 1:
        if(b==1&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c<<"天!"<<endl;
        else
        {
            if(b==2&&c<=28) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+31<<"天!"<<endl;
            else
            {
                if(b==3&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+59<<"天!"<<endl;
                else
                {
                    if(b==4&&c<=30) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+90<<"天!"<<endl;
                    else
                    {
                        if(b==5&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+120<<"天!"<<endl;
                        else
                        {
                            if(b==6&&c<=30) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+151<<"天!"<<endl;
                            else
                            {
                                if(b==7&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+181<<"天!"<<endl;
                                else
                                {
                                    if(b==8&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+212<<"天!"<<endl;
                                    else
                                    {
                                        if(b==9&&c<=30) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+243<<"天!"<<endl;
                                        else
                                        {
                                            if(b==10&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+273<<"天!"<<endl;
                                            else
                                            {
                                                if(b==11&&c<=30) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+304<<"天!"<<endl;
                                                else
                                                {
                                                    if(b==12&&c<=31) cout<<a<<"年"<<b<<"月"<<c<<"日是平年"<<a<<"年的第"<<c+334<<"天!"<<endl;
                                                    else cout<<"错误日期!"<<endl;
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        break;
    }
    return 0;
}

有兴趣的帮忙看下，这个码还有很多错误的运算，但是我数学不是很厉害，公式实在不知道杂用了，高手帮忙指点下。
能够帮忙简化和校正，感激不尽啊。

if(a%400==0||a%4==0&&a%100!=0)
这个高手，这个可以解释解释么~~~你的码没有备注，我看得不是很懂，刚学没几天呢~~~

呵呵，看懂了，谢谢啊，谢谢了，%是整除，我以为是除了之后可以有小数，如10%3=3.33333...看来我误会了，呵呵。只知道10/3=3.呵呵
十分感谢！

再问个问题~~~  -=是什么意思？sum-=31;   解释下，这个代码我就全懂咯。

呵呵，看懂了，谢谢啊，谢谢了，%是整除，我以为是除了之后可以有小数，如10%3=3.33333...看来我误会了，呵呵。只知道10/3=3.呵呵
十分感谢！

再问个问题~~~  -=是什么意思？sum-=31;   解释下，这个代码我就全懂咯。

再帮忙解释解释，呵呵，感激不尽啊，嘿嘿。

呵呵，因为我刚学，还不会简化程序。