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Minus.cc
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Minus.cc
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/*
Minus.cc A representation of the minus operator.
Copyright (C) 2008-14 Sakis Kasampalis <s.kasampalis@zoho.com>
(this file is part of the expression calculator).
The expression calculator is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License
as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
The expression calculator is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the expression calculator. If not, see
<http://www.gnu.org/licenses/>.
*/
#include <string>
#include <sstream>
#include "Minus.h"
using std::string;
using std::stringstream;
/**
* Evaluation of the minus
* operator.
*
* @return the substraction result of
* the left and right expressions.
*/
double Minus::eval() const
{
return (left->eval() - right->eval());
}
/**
* Initialisation of the Minus
* operator with two
* expressions.
*
* @param l a pointer to the
* left expression
* @param r a pointer to the
* right epxression
*/
Minus::Minus(Expr* l, Expr* r): BinOp (l, r) {}
/**
* A string representation
* of the substraction operator.
*
* @return a <i>string</i>
* instance of the substraction
* operator.
*/
string Minus::strOperator() const
{
return "-";
}