c语言设计一个简易计算器

以下是一个简单的C语言计算器程序，可以进行加、减、乘、除四种基本运算：

#include <stdio.h>

int main() {
    int choice;
    float num1, num2, result;
    printf("*****************计算器*****************\n");
    printf("**************1.加法计算****************\n");
    printf("**************2.减法计算****************\n");
    printf("**************3.乘法计算****************\n");
    printf("**************4.除法计算****************\n");
    printf("***************5.退出********************\n");
    printf("*************请选择(1~~5)***************\n");
    scanf("%d", &choice);
    switch (choice) {
        case 1:
            printf("请输入两个数进行加法计算：\n");
            scanf("%f %f", &num1, &num2);
            result = num1 + num2;
            printf("%.2f + %.2f = %.2f\n", num1, num2, result);
            break;
        case 2:
            printf("请输入两个数进行减法计算：\n");
            scanf("%f %f", &num1, &num2);
            result = num1 - num2;
            printf("%.2f - %.2f = %.2f\n", num1, num2, result);
            break;
        case 3:
            printf("请输入两个数进行乘法计算：\n");
            scanf("%f %f", &num1, &num2);
            result = num1 * num2;
            printf("%.2f * %.2f = %.2f\n", num1, num2, result);
            break;
        case 4:
            printf("请输入两个数进行除法计算：\n");
            scanf("%f %f", &num1, &num2);
            if (num2 == 0) {
                printf("除数不能为0！n");
            } else {
                result = num1 / num2;
                printf("%.2f / %.2f = %.2f\n", num1, num2, result);
            }
            break;
        case 5:
            printf("退出计算器！\n");
            break;
        default:
            printf("输入有误，请重新选择！\n");
            break;
    }
    return 0;
}