程序代码：

#include <stdio.h>
#include <stdlib.h>

int main(void) {
    int a, b, c, flag = 0;
    char ch;

    while(1) {
        flag = scanf("%d %c %d", &a, &ch, &b);
        fflush(stdin);

        if(flag) {
            switch(ch) {
                case '+': {
                        c = a + b;
                        printf("%d\n", c);
                        break;
                    }

                case '-': {
                        c = a - b;
                        printf("%d\n", c);
                        break;
                    }

                case '*': {
                        c = a * b;
                        printf("%d\n", c);
                        break;
                    }

                case '/': {
                        if(b != 0) {
                            c = a / b;
                            printf("%d\n", c);
                        }

                        break;
                    }

                default:
                    break;
            }

        } else break;
    }

    return 0;
}