자바 소형 알고리즘 02 (덧셈, 뺄셈, 곱셈, 나눗셈 실현)

코드 예

package com.hao.method;

import java.util.Scanner;

public class Demo09 {
    public static void main(String[] args) {
        double a, b;
        String str;
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入算式（每输入一个数字或字符后请按回车）：");
        a = scanner.nextDouble();
        str=scanner.next();
        b=scanner.nextDouble();
        switch(str){
            case "+":
                System.out.println(addition(a,b));
                break;
            case"-":
                System.out.println(subtraction(a,b));
                break;
            case"*":
                System.out.println(multiplication(a,b));
                break;
            case"/":
                System.out.println(divisiond(a,b));
                break;
        }
    }
    //加法
    public static double addition(double a,double b){
        return a+b;
    }
    //减法
    public static double subtraction(double a,double b){
        return a-b;
    }
    //乘法
    public static double multiplication(double a,double b){
        return a*b;
    }
    //除法
    public static double divisiond(double a,double b){
        return a/b;
    }
}

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