package exercises;

public class calc 
{
	private double firstNumber;
	private double secondNumber;
	private double result;
	private byte operation;
	private String errorMessage;
	
	void clearAll()
	{
		firstNumber = 0;
		secondNumber = 0;
		result = 0;
		operation = 0;
		errorMessage = "";
	}
	
	calc()
	{
		clearAll();
	}
	
	
	void setFirstNumber()
	{
		System.out.println("Ââåäèòå ïåðâîå ÷èñëî: "); 
		input value = new input((byte)1);
		this.firstNumber = value.value;
	}
	void setSecondNumber()
	{
		System.out.println("Ââåäèòå âòîðîå ÷èñëî: "); 
		input value = new input((byte)1);
		this.secondNumber = value.value;
	}
	
	void calculate(byte choise)
	{
		this.operation = choise;
		switch (this.operation) 
		{
		case 1:
			this.setFirstNumber();
			this.setSecondNumber();
			this.result = this.firstNumber + this.secondNumber;			
			break;
		case 6:
			this.setFirstNumber();
			while (this.firstNumber < 0)  
				this.setFirstNumber();
			this.result = Math.sqrt(this.firstNumber);			
			break;		
		case 7:
			break;		
		default:
			this.errorMessage = "Îøèáêà âûáîðà îïåðàöèè!";
			this.operation = 0;
			break;
		}
			
	}
	
	public double getResult()
	{
		return this.result;
	}

	public double getFirstNumber()
	{
		return this.firstNumber;
	}

	public double getSecondNumber()
	{
		return this.secondNumber;
	}

	public byte getOperation()
	{
		return this.operation;
	}

	public String getErrorMessage()
	{
		return this.errorMessage;		
	}
}