Question

初学java，基础差，麻烦高手写一下代码，参考一下，谢谢了。如图第二题。

Answer 1

import java.util.Scanner;

class Ca{
	private double a;
	private double b;
	public double add(double a, double b){
		return a + b;
	}
	
	public double jian(double a, double b){
		return a - b;
	}
	
	public double chen(double a, double b){
		return a * b;
	}
	
	public double chu(double a, double b){
		if(b == 0){
			System.out.println("除数不能为0");
			return (Double) null;
		}else{
			return a / b;
		}
	}
}
public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("输入第一个数:");
		double a = sc.nextDouble();
		System.out.println("输入第二个数:");
		double b = sc.nextDouble();
		System.out.println("两个数的和 : " + new Ca().add(a, b));
		System.out.println("两个数的差 : " + new Ca().jian(a, b));
		System.out.println("两个数的积 : " + new Ca().chen(a, b));
		System.out.println("两个数的商 : " + new Ca().chu(a, b));
	}
}

追问

帮忙做下这题，谢谢了。

Answer 2

package baiqianbaiji;

import java.util.Scanner;

public class baiqianbaiji
{

@SuppressWarnings("resource")
public static void main(String[] args)
{
// TODO Auto-generated method stub
Scanner s = new Scanner(System.in);
System.out.println("请输入连个数");
double a = s.nextDouble();
double b = s.nextDouble();
Cal cal = new Cal();
cal.jia(a,b);
cal.jian(a, b );
cal.cheng(a, b);
cal.chu(a, b);

}

static class Cal
{

public void jia(double i ,double j)
{
System.out.println(i+"+"+j +"=" +(i+j));

}

public void jian(double i ,double j)
{

System.out.println(i+"-"+j+"="+(i-j));

}

public void cheng(double i ,double j)
{
System.out.println(i+"*"+j+"="+(i*j));
}

public void chu(double i ,double j)
{

System.out.println(i+"/"+j+"="+(i/j));
}

}

}