计算器1.0版

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        int k = 0; //表示算术类型
        System.out.println("请选择要进行的计算类型(1：加，2：减，3：乘，4：除)：");
        Scanner scanner = new Scanner(System.in);
        k = scanner.nextInt();

        System.out.println("请输入第一个数：");
        double c1 = scanner.nextDouble();
        System.out.println("请输入第二个数：");
        double c2 = scanner.nextDouble();

        switch (k){
            case 1:
                System.out.println("计算结果是：" +plus(c1,c2));
                break;
            case 2:
                System.out.println("计算结果是：" +minus(c1,c2));
                break;
            case 3:
                System.out.println("计算结果是：" +multiple(c1,c2));
                break;
            case 4:
                System.out.println("计算结果是：" +division(c1,c2));
                break;
        }

    }

    //加法函数
    public static double plus(double num1,double num2){
        double result = num1 + num2;
        return result;
    }
    //减法函数
    public static double minus(double num1,double num2){
        double result = num1 - num2;
        return result;
    }
    //乘法函数
    public static double multiple(double num1,double num2){
        double result = num1 * num2;
        return result;
    }
    //除法函数
    public static double division(double num1,double num2) {
        double result = num1 / num2;
        return result;
    }
}