c语言输入年和月，输出x年x月该月的总天数

#include <stdio.h>


int main()
{
  int year=0;
  int mouth=0;
  printf("请输入年月：");
  scanf("%d %d",&year,&mouth);
  if(mouth==1 || mouth==3 || mouth==5 || mouth==7 || mouth==8 || mouth==10 || mouth==12)
  printf("%d年的%d月有31天",year,mouth);
  else if(mouth==4||mouth==6||mouth==9||mouth==11)
printf("%d年的%d月有30天",year,mouth);
if((year%4==0 && year%100!=0)|| year%400==0)
    printf("%d年的2月有29天",year);
  else
    printf("%d年的2月有28天",year);
    return 0; 

}

一次成功