【C语言】一个简易的计算器

#include <stdio.h>

int main() {
    printf("欢迎使用简易运算器\n");
    printf("1.加法\n2.减法\n3.乘法\n4.除法\n0.退出运算器");
    int choice;
    double a, b, c;
    printf("\n请输入数字以选择运算方式：");
    scanf("%d", &choice);
    printf("\n请输入运算数：");
    printf("请输入第1个数：");
    scanf("%lf", &a);
    printf("\n请输入第2个数：");
    scanf("%lf", &b);
    if (choice == 1) {
        c = a + b;
        printf("\n运算结果：%lf+%lf=%lf\n",a,b,c);
    } else if (choice == 2) {
        c = a - b;
        printf("\n运算结果：%lf-%lf=%lf\n",a,b,c);
    } else if (choice == 3) {
        c = a * b;
        printf("\n运算结果：%lf*%lf=%lf\n",a,b,c);
    } else if (choice == 4) {
        if (b !=0) {
            c = a / b;
            printf("\n运算结果：%lf/%lf=%lf\n",a,b,c);
        } else {
            printf("\n输入的除数不能为零");
        }

    } else if (choice == 0) {
        printf("\n退出运算器");
    } else {
        printf("\n输入选择有误，请重新输入!");
    }
    return 0;
}