public Calculator()
{
arithmeticUnit = new ArithmeticUnit();
controlUnit = new ControlUnit();
}
public Subtract(ArithmeticUnit unit, double operand)
{
this.unit = unit;
this.operand = operand;
}
public Divide(ArithmeticUnit unit, double operand)
{
this.unit = unit;
this.operand = operand;
}
public Multiply(ArithmeticUnit unit, double operand)
{
this.unit = unit;
this.operand = operand;
}