使用OOP结构增加和减少复数 [英] Adding and subtract complex numbers using OOP structure

问题描述

我这里有一个代码，应该打印两个复数的和与差.给出的说明是:
将方法add，subtract和print设置为void和
使用构造函数的对象进行测试.

I have here a code that should print the sum and difference of two complex numbers. The instructions given are:
make the methods add, subtract, and print to be void and
test using the constructor's object.

public class Complex {

    /**
     * @param args
     */
    public double real;
    public double imag;
    public String output = "";

    public Complex(double real, double imag){
        this.real += real;
        this.imag += imag;
    }

    public Complex(){
        real = 0;
        imag = 0;
    }

    public double getReal(){
        return real;
    }

    public void setReal(double real){
        this.real = real;
    }

    public double getImag(){
        return imag;
    }

    public void setImag(double imag){
        this.imag = imag;
    }

    public void add(Complex num){
        this.real = real + num.real;
        this.imag = imag + num.imag;
    }

    public void subtract(Complex num){
        this.real = real - num.real;
        this.imag = imag - num.imag;
    }

    public void print(){
        //
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Complex c1 = new Complex(4.0, 8.5);
        Complex c2 = new Complex(8.0, 4.5);

        c1.add(c2);
        c1.subtract(c2);
        c1.print(); //expected answer 12.0 + 13.0i
                                    //-4.0 - 4.0i
    }

}

预期的答案是12.0 + 13.0i和-4.0-4.0i.请使用方法print帮助我.谢谢.

The expected answers are 12.0 + 13.0i and -4.0 - 4.0i. Please help me with the method print. Thank you.

推荐答案

您错误地使用了打印方法.如果要查看正确的结果，则需要重写如下的add方法:

You incorrectly use print merhod. if you want to see correct result you need to rewrite add method like this:

public void add(Complex num, Complex num2){
    this.real = num.real + num2.real;
    this.imag = num.imag + num2.imag;
}

也重写减法.

public void subtract(Complex num){
    this.real = real - num.real;
    this.imag = imag - num.imag;
}

现在主要方法如下:

public static void main(String[] args) {
        Complex c1 = new Complex(4.0, 8.5);
        Complex c2 = new Complex(8.0, 4.5);
        Complex result = new Complex(8.0, 4.5);
        result.add(c1,c2);

        result.print();

        result.subtract(c1,c2);
        result.print();

我以前说过的

print方法看起来像:

print method as I told previously look like:

public void print(){
    System.out.println(real + " " + imag +"i");
}

说明:

您的代码中有错误.您将c2加到c1，然后减去c2 frim c1，然后打印结果.数学上看起来像是:c1 = c1 + c2-c2;

In your code you have error. You add c2 to c1 and then subtract c2 frim c1 and then print result. Mathematically this looks like : c1= c1+c2-c2;

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