if else 编的计算器

#include<stdio.h>
int main(void)
{
int a, b, c;
char fuhao;
printf("请正规输入数字跟符号，否则我脑子就会死机\n");
scanf("%d%c%d",&a, &fuhao, &b);
if('*' == fuhao)
{
c=a*b;
printf("c=%d\n", c);
}
else if('/' == fuhao)
{
c=a/b;
printf("c=%d\n", c);
}
else if('+' == fuhao)
{
c=a+b;
printf("c=%d\n", c);
}
else if('-' == fuhao)
{
c=a-b;
printf("c=%d\n", c);
}
else;
}