加减乘除

1.首先，我们先定义加法、减法、乘法、除法的运算方法

public static  double add(double a,double b){

    return  a+b;
}
public static  double sub(double a,double b){
    return  a-b;
}
public static  double mul(double a,double b){

    return  a*b;
}
public static  double div(double a,double b){

    return  a/b;
}
2.然后利用Scanner接收输入端的数值

Scanner scanner =new Scanner(System.in);
System.out.println("输入第一个数");
double a=scanner.nextDouble();
System.out.println("输入第二个数");
double b=scanner.nextDouble();
3.调用加减乘除方法

  Homework formulate=new Homework();
    System.out.println("加法运算结果为："+formulate.add(a,b));
    System.out.println("减法运算结果为："+formulate.sub(a,b));
    System.out.println("乘法运算结果为："+formulate.mul(a,b));
    System.out.println("除法运算结果为："+formulate.div(a,b));

}



整个运算的代码如下

package com.zhaowei.example.Method;

import java.util.Scanner;

public class Homework {
    public static void main(String[] args) {
        Scanner scanner =new Scanner(System.in);
        System.out.println("输入第一个数");
        double a=scanner.nextDouble();
        System.out.println("输入第二个数");
        double b=scanner.nextDouble();

       Homework formulate=new Homework();
        System.out.println("加法运算结果为："+formulate.add(a,b));
        System.out.println("减法运算结果为："+formulate.sub(a,b));
        System.out.println("乘法运算结果为："+formulate.mul(a,b));
        System.out.println("除法运算结果为："+formulate.div(a,b));

    }
    public static  double add(double a,double b){

        return  a+b;
    }
    public static  double sub(double a,double b){
        return  a-b;
    }
    public static  double mul(double a,double b){

        return  a*b;
    }
    public static  double div(double a,double b){

        return  a/b;
    }

}