Division.cpp

/*
*Name: Junhao Wang, Colin Vandenhof, Teshaun Murray
*MacID: wangjh2, vandencm, murrayts
*Student Number: 1215428, 1231644, 1227515
*Description: division class definitions for constructor, destructor, print and evaluate.
*/
#include <sstream>
#include "Division.h"
using namespace std;


//Division constructor
Division::Division(string ls, string rs, string branch):
		ArithmeticExpression(ls, rs, branch) { //call parent class constructor
}

//Division destructor
Division::~Division() {
	if (right) {//if the right object pointer is not NULL
		delete right;//delete the right object
	}
	if (left) {//if the left object pointer is not NULL
		delete left;//delete the left object
	}
}

//This function evaluates the expression in the current node.
string Division::evaluate() {

	if (this->branch == "bothleaf") {//if the node branches to two numbers.
		return tostring(convert(leftstring.c_str()) / convert(rightstring.c_str())); //return a string containing result of leftstring/rightstring
	} else if (this->branch == "rightleaf") {//if only the right branch is a number.
		return tostring(convert(left->evaluate()) / convert(rightstring.c_str()));//return a string containing result of (left evaluate())/rightstring
	} else if (this->branch == "leftleaf") {//if only the left branch is a number.
		return tostring(convert(leftstring.c_str()) / convert(right->evaluate()));//return a string containing result of leftstring/(right evaluate())
	} else
		return tostring(convert(left->evaluate()) / convert(right->evaluate()));//if both direct branches are not numbers, return the string containing the result of left evaluate() / right evaluate()

}
//This function prints the expression as represented in the current node (and below).
void Division::print() {
	if (this->branch == "bothleaf") {//if the node branches to two numbers.
		cout << "(" + leftstring + "/" + rightstring + ")";//print a string that shows left number "/" right number, enclosed in brackets
	}
	else if (this->branch == "rightleaf") {//if only the right branches to a number.
		cout << "("; left->print(); cout << "/" + rightstring + ")"; //print opening bracket, call left print, print operator, right number, and closing bracket
	} else if (this->branch == "leftleaf") {//if only the left branches to a number.
		cout << "(" + leftstring + "/"; right->print(); cout << ")";//print opening bracket, left number and operator, call left print, print closing closing bracket
	} else { //if neither left nor right branches to a number
		cout << "("; left->print(); cout << "/";right->print(); cout << ")";//print opening bracket, call left print(), print operator, call right print, print closing bracket
	}
}