class Square extends Quadrilaterals {
	private static int numOfSquares = 0;
	private double sideLength;
	private int serialNumber;

	public Square() {
		sideLength = 1.0;
		numOfSquares++;
		serialNumber = numOfSquares;
	} //End of Square method

	public Square(double sideLength){
		this.sideLength = sideLength;
	}

	public Square(boolean check) {
		sideLength = 1.0;
		if (check == true) {
			numOfSquares++;
			serialNumber = numOfSquares;
		}
	}

	public double getSideLength() {
		return sideLength;
	} //End of getSideLength method

	public void setSideLength(double sideLength) {
		this.sideLength = sideLength;
	} //End of setSideLength method

	public int getSerialNumber() {
		return serialNumber;
	}

	public double findPerimeter() {
		return 4*sideLength;
	} //End of findPerimeter method

	public double findArea() {
		return sideLength*sideLength;
	} //End of findArea method

	public static int getNumOfSquares() {
		return numOfSquares;
	} //End of getNumOfSquares method

	public String toString() {
		return ("[Square " + serialNumber + "]\nLength: " + getSideLength() + "\nThe area is " + findArea() + "\nThe perimeter is " + findPerimeter() + "\n");
	} //End of toString method

	public boolean equals(Object o) {
		if (o instanceof Square) {
			Square s = (Square)o;
			if (this.getSerialNumber() == s.getSerialNumber())
				return true;
		}
		return false;
	} //End of equals method
} //End of class Square