/*
 COMP 1006 - Day 04
 Complex Class (with static variable and method)
 mjh-2013
*/


public class Complex2{
	int re_;   // real part of the number
	int im_;   // imaginary part of the number

	// static counter to keep track of how many instances are created
	static int count = 0; // this belongs to the Class and not any instance

	
	// method for adding two complex numbers 
	public Complex2 plus(Complex2 other){
		this.re_ += other.re_;  // using "this" here is optional
		this.im_ += other.im_;
		return this;   // using "this" here is needed
	}

	// another method for addition
	// this method modifies the calling object
	// by adding the input number to it
	public void addWith(Complex2 other){
		this.re_ += other.re_;   // using "this" is optional
		this.im_ += other.im_;	 
	}

	

	// static method for addition
	// there is no calling object with this method
	public static Complex2 add(Complex2 first, Complex2 second){
		Complex2 answer = new Complex2();
		answer.re_ = first.re_ + second.re_;
		answer.im_ = first.im_ + second.im_;
		return answer;
		
		/* this method can be more compactly written as		 
		return Complex2(first.re_ + second.re_, first.im_ + second.im_);
		*/
	} 


	// constructors for complex numbers	
	Complex2(){
		// zero paramater constructor
		re_ = 0;  // could have put this.re_ = re;  
		im_ = 0;  // could have put this.im_ = im; 
		count += 1;  // you cannot use "this" with a static variable
	}
	
	Complex2(int re, int im){
		this.re_ = re;   // I will use "this" when I write code  
		this.im_ = im;   // You can do either.  Just be consistent
		count += 1;    // You cannot use "this" with a static variable
	}
	
}