public Add(IRpnExpression leftExpression, IRpnExpression rightExpression) { _leftExpression = leftExpression; _rightExpression = rightExpression; }
public Multiply(IRpnExpression leftExpression, IRpnExpression rightExpression) { _leftExpression = leftExpression; _rightExpression = rightExpression; }
public Subtraction(IRpnExpression leftExpression, IRpnExpression rightExpression) { _leftExpression = leftExpression; _rightExpression = rightExpression; }
public Divide(IRpnExpression leftExpression, IRpnExpression rightExpression) { _leftExpression = leftExpression; _rightExpression = rightExpression; }