5-12 两个数的简单计算器 (10分)

#include <stdio.h>

int main()
{
int a,c,sum;
char b;
scanf("%d %c %d", &a,&b,&c);
if(b=='+')
{
sum=a+c;
printf("%d",sum);
}else if(b=='-')
{
sum=a-c;
printf("%d",sum);
}else if(b=='*')
{
sum=a*c;
printf("%d",sum);
}else if(b=='/')
{
sum=a/c;
printf("%d",sum);
}else if(b=='%')
{
sum=a%c;
printf("%d",sum);
}else
{
printf("ERROR");
}
}