06-1. 简单计算器(20)

 1 #include <stdio.h>
 2 
 3 int main()
 4 {
 5     int x, flag = 0;
 6     int result;
 7     char ch = ‘1‘;
 8     scanf("%d", &result);
 9     
10     while(ch != ‘=‘) {
11         scanf("%c", &ch);
12         if(ch == ‘=‘) 
13             break;
14         scanf("%d", &x);
15         if(ch == ‘+‘) {
16             result += x;
17         }
18         else if(ch == ‘-‘) {
19             result -= x;
20         }
21         else if(ch == ‘*‘) {
22             result *= x;
23         }
24         else if(ch == ‘/‘) {
25             if(x != 0) {
26                 result /= x;
27             }
28             else 
29                 flag = 1;
30         }
31         else 
32             flag = 1;
33     }
34     if(flag) {
35         printf("ERROR");
36     }
37     else 
38         printf("%d\n", result);
39         
40     return 0;
41 }