Realize the addition, subtraction, multiplication, and division of complex numbers.
Complex:
package com.itheima1;
public class ComplexNumber {
private double realPart,imageinaryPart;
public ComplexNumber() {
realPart = 0.0;
imageinaryPart = 0.0;
}
public ComplexNumber(double realPart, double imageinaryPart) {
this.realPart = realPart;
this.imageinaryPart = imageinaryPart;
}
public double getRealPart() {
return realPart;
}
public void setRealPart(double realPart) {
this.realPart = realPart;
}
public double getImageinaryPart() {
return imageinaryPart;
}
public void setImageinaryPart(double imageinaryPart) {
this.imageinaryPart = imageinaryPart;
}
public ComplexNumber add(ComplexNumber aComNum){
if(aComNum == null){
System.out.println("对象不能够为null");
return new ComplexNumber();
}
return new ComplexNumber(this.realPart + aComNum.getRealPart(),
this.imageinaryPart + aComNum.getImageinaryPart());
}
public ComplexNumber decrease(ComplexNumber aComNum){
if(aComNum == null){
System.out.println("对象不能够为null");
return new ComplexNumber();
}
return new ComplexNumber(this.realPart - aComNum.getRealPart(),
this.imageinaryPart - aComNum.getImageinaryPart());
}
public ComplexNumber multiply(ComplexNumber aComNum){
if(aComNum == null){
System.out.println("对象不能够为null");
return new ComplexNumber();
}
double r = this.realPart * aComNum.getRealPart() -
this.imageinaryPart * aComNum.getImageinaryPart();
double i = this.imageinaryPart * aComNum.getRealPart() +
this.realPart * aComNum.getImageinaryPart();
return new ComplexNumber(r,i);
}
public ComplexNumber divide(ComplexNumber aComNum){
if(aComNum == null){
System.out.println("对象不能够为null");
return new ComplexNumber();
}
if((aComNum.imageinaryPart == 0) && (aComNum.realPart == 0)){
System.out.println("除数不能为零");
return new ComplexNumber();
}
double temp = aComNum.getRealPart() * aComNum.getRealPart() +
aComNum.getImageinaryPart() * aComNum.getImageinaryPart();
double crealpart = (this.realPart * aComNum.getRealPart()
+ this.imageinaryPart * aComNum.imageinaryPart) / temp;
double cimaginary = (this.imageinaryPart * aComNum.getRealPart() -
this.realPart * aComNum.getImageinaryPart()) / temp;
return new ComplexNumber(crealpart,cimaginary);
}
@Override
public String toString() {
return this.realPart + " + " + this.imageinaryPart + "i";
}
}
Main:
package com.itheima1;
public class Main {
public static void main(String[] args) {
ComplexNumber a = new ComplexNumber(2,4);
ComplexNumber b = new ComplexNumber(1,2);
System.out.println("ComplexNumber a: " + a.toString());
System.out.println("ComplexNumber b: " + b.toString());
System.out.println("(a + b ) = " + a.add(b).toString());
System.out.println("(a - b ) = " + a.decrease(b).toString());
System.out.println("(a * b ) = " + a.multiply(b).toString());
System.out.println("(a / b ) = " + a.divide(b).toString());
}
}
