程序介绍

本程序是一个简易的计算器（支持小数运算），计算能力是四则运算（加减乘除）。需要的知识内容：函数，选择语句，循环语句。

源码展示

#include <stdio.h>
//加法模块
double Add(double x, double y)
{return x + y;
}
//减法模块
double Sub(double x, double y)
{return x - y;
}
//乘法模块
double Mul(double x, double y)
{return x * y;
}
//除法模块
double Div(double x, double y)
{return x / y;
}
int main()
{int input = 0;double num1, num2;while (1){//打印菜单printf("**********************\n");printf("******1.加法运算******\n");printf("******2.减法运算******\n");printf("******3.乘法运算******\n");printf("******4.除法运算******\n");printf("******0.退出    ******\n");printf("**********************\n");printf("请选择：\n");scanf("%d", &input);if (input != 0){printf("请输入想要计算的两个数:\n");scanf("%lf %lf", &num1, &num2);}else{printf("程序结束!\n");break;}//判断需求switch (input){case 1:printf("%.2lf + %.2lf = %.2lf\n", num1, num2, Add(num1, num2));break;case 2:printf("%.2lf - %.2lf = %.2lf\n", num1, num2, Sub(num1, num2));break;case 3:printf("%.2lf * %.2lf = %.2lf\n", num1, num2, Mul(num1, num2));break;case 4:printf("%.2lf / %.2lf = %.2lf\n", num1, num2, Div(num1, num2));break;default:printf("输入错误，请重新输入:\n");break;}}return 0;
}