输入年月出日，我不晓得怎么没输出

Question

#include<stdio.h>
int main()
{
int a,b;
scanf("%d%d",&a,&b);
if(b==2)
{
if(a%400==0){
printf("29");
}else if (a%4!=0){printf("28");
}else if(a%100==0&&a%400!=0) {
printf("28");

   }

}
else if(b!=2){
switch(b){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:printf("31");break;
case 4:
case 6:
case 9:
case 11:printf("30");break;

}
}
return 0;

}

Answer 1

scanf("%d%d",&a,&b);
改为
scanf("%d\\%d",&a,&b);