int a, b, c;char op;int flag = 1;scanf("%d%c%d", &a, &op, &b);//if (b == 0)// printf("除数不能为0！");//if (b != 0)switch (op){ case '+':c = a + b;break;case '-':c = a - b;break;case '*':c = a * b;break;case '/':if(b==0)...