6-1. 简单计算器(20)

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