十月一假期作业

#include<stdio.h>
int main()
{
    int year,month,day;
    printf("请输入今天的日期，格式如：2016-10-04。\n");
    scanf("%d-%d-%d",&year,&month,&day);
    if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
    {
        if(day>0&&day<=30)
        {
            day=day+1;
            printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
        }
        else if(day==31)
        {
            day=1,month=month+1;
            if(month<=12)
            {
                printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
            }
            else
            {
                year=year+1,month=1;
                printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
            }
        }
        else
        {
            printf("日期错误，请关闭程序，重新输入。\n");
        }
    }
    else if(month==4||month==6||month==5||month==9||month==11)
    {
        if(day>0&&day<=29)
        {
            day=day+1;
            printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
        }
        else if(day==30)
        {
            day=1,month=month+1;
            if(month<=12)
            {
                printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
            }
            else
            {
                year=year+1,month=1;
                printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
            }
        }
        else
        {
            printf("日期错误，请关闭程序，重新输入。\n");
        }
    }
    else if(month==2)
    {
        if(year%4==0&&year%100!=0||year%400==0)
        {
            if(day>0&&day<=28)
            {
                day=day+1;
                printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
            }
            else if(day==29)
            {
                day=1,month=month+1;
                if(month<=12)
                {
                    printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
                }
                else
                {
                    year=year+1,month=1;
                    printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
                }
            }
            else
            {
                printf("日期错误，请关闭程序，重新输入。\n");
            }
        }
        else
        {
            if(day>0&&day<=27)
            {
                day=day+1;
                printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
            }
            else if(day==28)
            {
                day=1,month=month+1;
                if(month<=12)
                {
                    printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
                }
                else
                {
                    year=year+1,month=1;
                    printf("明天的日期为%4d-%02d-%02d。\n",year,month,day);
                }
            }
            else
            {
                printf("日期错误，请关闭程序，重新输入。\n");
            }
            
        }
    }
    else
    {
        printf("日期错误，请关闭程序，重新输入。\n");
    }
    return 0;
}