public void multiply() {
operand_0 = operand_1.mul(operand_0);
operand_1 = new Rational();
}
/** Multiplicatie van operand 1 en operand 2 */
public void multiply() {
operand_0 = operand_1.mul(operand_0);
operand_1 = new Rational();
processEvent(new ActionEvent(this, ActionEvent.ACTION_PERFORMED, null));
}
