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xuanthulabnet/Complex.java Created September 11, 2019 16:20 Show Gist options

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package net.xuanthulab;

public class Complex {

private double re; // phần thực

private double im; // phần ảo

//Thiết lập phần thực vào ảo

private void Init(double re, double im) {

this.re = re;

this.im = im;

};

// Khởi tạo mặc định, không tham số (phần ảo, thực bằng 0)

public Complex() {

Init(0,0);

}

// Khởi tạo với phần thực và phần ảo

public Complex(double re, double im) {

Init(re, im);

}

// Khởi tạo 1 tham số là phần thực, phần ảo bằng 0

public Complex(double re) {

Init(re, 0);

}

// Khởi tạo từ một số phức khác

public Complex(Complex complex) {

Init(complex.getRe(), complex.getIm());

}

//Getter thuộc tinh phần thực re

public double getRe() {

return re;

}

public double getIm() {

return im;

}

//Setter thuộc tinh phần thực re

public void setRe(double re) {

this.re = re;

}

public void setIm(double im) {

this.im = im;

}

// phép cộng hai số phức a + b

public static Complex cong(Complex a, Complex b) {

double real = a.re + b.re;

double imag = a.im + b.im;

return new Complex(real, imag);

}

// Trừ 2 số phức a - b

public static Complex tru(Complex a, Complex b) {

double real = a.re - b.re;

double imag = a.im - b.im;

return new Complex(real, imag);

}

// Nhân 2 số phức a * b

public static Complex nhan(Complex a,Complex b) {

double real = a.re * b.re - a.im * b.im;

double imag = a.re * b.im + a.im * b.re;

return new Complex(real, imag);

}

// Chia 2 số phức a / b

public static Complex chia(Complex a, Complex b) {

double _re = b.getRe();

double _im = b.getIm();

double scale = _re*_re + _im*_im;

return nhan(a, new Complex(_re / scale, -_im / scale));

}

public String toString() {

if (im == 0) return re + "";

if (re == 0) return im + "i";

if (im < 0) return re + " - " + (-im) + "i";

return re + " + " + im + "i";

}

}

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