Question 4.17:Write a Java class Complex for dealing with complex number. Your class must have the following features:
• Instance variables :
o realPart for the real part of type double
o imaginaryPart for imaginary part of type double.
• Constructor:
o public Complex (): A default constructor, it should initialize the number to 0, 0)
o public Complex (double realPart, double imaginaryPart): A constructor with
parameters, it creates the complex object by setting the two fields to the passed values.
• Instance methods:
o public Complex add (Complex otherNumber): This method will find the sum of the current complex number and the passed complex number. The methods returns a new Complex number which is the sum of the two.
o public Complex subtract (Complex otherNumber): This method will find the
difference of the current complex number and the passed complex number. The
methods returns a new Complex number which is the difference of the two.
o public Complex multiply (Complex otherNumber): This method will find the
product of the current complex number and the passed complex number. The methods returns a new Complex number which is the product of the two.
o public Complex divide (Complex otherNumber): This method will find the ... of the current complex number and the passed complex number. The methods returns a new Complex number which is the ... of the two.
o public void setRealPart (double realPart): Used to set the real part of this complex number.
o public void setImaginaryPart (double realPart): Used to set the imaginary part of this complex number.
o public double getRealPart(): This method returns the real part of the complex number
o public double getImaginaryPart(): This method returns the imaginary part of the complex number
o public String toString(): This method allows the complex number to be easily printed out to the screen
Write a separate class ComplexDemo with a main() method and test the Complex class methods.
Solution:
package com.company;
import java.util.Scanner;
public class lab4problem17{
public static void main(String[] args) {
Scanner Obj = new Scanner(System.in);
System.out.print("Enter your real number: " );
double realNumber = Obj.nextDouble();
System.out.print("Enter your imaginary number: ");
double imaginaryNamber = Obj.nextDouble();
Complex com = new Complex(realNumber,imaginaryNamber);
System.out.print("Enter your 2nd real number: " );
double realNamber2 = Obj.nextDouble();
System.out.print("Enter your 2nd imaginary number: ");
double imaginaryNamer2 = Obj.nextDouble();
Complex com2 = new Complex (realNamber2 ,imaginaryNamer2);
Complex com3 = new Complex();
com3 = com3.Add(com,com2);
System.out.println("Add number: "+com3);
com3 = com3.subtract(com,com2);
System.out.println("subtracting: "+com3);
com3 = com3.multiply(com,com2);
System.out.println("multiply: "+com3);
com3 = com3.divide(com,com2);
System.out.println("divide: "+com3);
}
}
public class Complex {
double realpart;
double imaginarypart;
public Complex(double realpart, double imaginarypart) {
this.realpart = realpart;
this.imaginarypart = imaginarypart;
}
public Complex(){
}
public Complex Add(Complex com, Complex com2){
Complex temp = new Complex();
temp.realpart= com.realpart + com2.realpart;
temp.imaginarypart = com.imaginarypart + com2.imaginarypart;
return temp;
}
public Complex subtract(Complex com, Complex com2){
Complex temp = new Complex();
temp.realpart= com.realpart - com2.realpart;
temp.imaginarypart = com.imaginarypart - com2.imaginarypart;
return temp;
}
public Complex multiply(Complex com, Complex com2){
Complex temp = new Complex();
temp.realpart= com.realpart * com2.realpart;
temp.imaginarypart = com.imaginarypart * com2.imaginarypart;
return temp;
}
public Complex divide(Complex com, Complex com2){
Complex temp = new Complex();
temp.realpart= com.realpart / com2.realpart;
temp.imaginarypart = com.imaginarypart / com2.imaginarypart;
return temp;
}
public void setRealpart(double realpart) {
this.realpart = realpart;
}
public void setImaginarypart(double imaginarypart) {
this.imaginarypart = imaginarypart;
}
public double getRealpart() {
return realpart;
}
public double getImaginarypart() {
return imaginarypart;
}
@Override
public String toString() {
return this.realpart +
"+" +this.imaginarypart+"i";
}
}
