#include <stdio.h>

float Calculator(float a, float b, char operator) 
{
    switch (operator) 
    {
        case '+':
            return a + b;
        case '-':
            return a - b;
        case '*':
            return a * b;
        case '/':
            if (b != 0) {
                return a / b;
            } 
            else {
                printf("除数不能为0\n");
                return 0;
            }
        default:
            printf("用其它符号就不简单了哟 ^_^\n");
            return 0;
    }
}
int main() 
{
    float a, b;
    char operator;

    printf("输入第一个数字: ");
    scanf("%f", &a);
    printf("输入运算符 (+, -, *, /): ");
    scanf(" %c", &operator);
    printf("输入第二个数字: ");
    scanf("%f", &b);
    

    printf("结果是:%.2f\n",Calculator(a, b, operator));

    return 0;
}