public class Operacoes{

	private int valor = 0;

	public void Soma(int valor1, int valor2){
		valor = valor1 + valor2;
	}

	public void Subtrai(int valor1, int valor2){
		valor = valor1 - valor2;
	}

	public void Multiplica(int valor1, int valor2){
		valor = valor1 * valor2;
	}

	public void Divide(int valor1, int valor2) throws ArithmeticException{
		if(valor2 == 0){
			throw new ArithmeticException();
		}else{
			valor = valor1 / valor2;
		}
	}

	public int getValor() throws NegaException{
		if(valor < 0){
			throw new NegaException();
		}
		return valor;
	}
}