简单c语言问题，有人能帮我一下吗，实在不会

#include<stdio.h>
int main(void)
{
    int a=0,b=0;
    scanf("%d%d",&a,&b);
    printf("%d + %d = %d\n",a,b,a+b);
    printf("%d - %d = %d\n",a,b,a-b);
    printf("%d * %d = %d\n",a,b,a*b);
    if(b!=0)
    {
        printf("%d / %d = %d\n",a,b,a/b);
        printf("%d %% %d = %d\n",a,b,a%b);
    }
    else
        printf("inf\ninf\n");
    return 0;
}