各位大佬，我这个为什么运行失败了呀？

#include <stdio.h>
int main()
{
    int year = 2008;
    int month = 8;
    int day = 8;
     if(year%4==0&&year%400==0&&month>2)
    {
        day+=1;
       
    }
    else
    {
        day=day
    }
     switch(month)
    {
        case1:
        result=31+day;break;
        case2:
        result=31+28+day;break;
        case3:
        result=31+28+31+day;break;
        case4:
        result=31+28+31+30+day;break;
        case5:
        result=31+28+31+30+31+day;break;
        case6:
        result=31+28+31+30+31+30+day;break;
        case7:
        result=31+28+31+30+31+30+31+day;break;
        case8:
        result=31+28+31+30+31+30+31+31+day;break;
     }
    printf("%d",result);
    return 0;
}