7-20 简单计算器

#include<stdio.h>
int main() 
{
	int a,b,result;
	char c;
	scanf("%d",&a);
	result = a;
	while(1){
		scanf("%c",&c);
		if(c=='='){
			printf("%d",result);
			break;
		}else{
			scanf("%d",&b);
			if(c=='+'){
				result=b+result;
			}else if(c=='-'){
				result=result-b;
			}else if(c=='*'){
				result=result*b;
			}else if(c=='/'){
				if(b==0){
					printf("ERROR");
					break;
				}else{
					result=result/b;
				}	
			}else{
				printf("ERROR");
				break;
			}
		}
	}
	return 0;
}

不知道对不对啊