Stack_Class

Stack_Class

//  Stack.h
//  Stack_Class
//
//  Created by Sergiy on 23.02.17.


#ifndef Stack_h
#define Stack_h

#include <iostream>
#include <string>
#include <string.h>

using namespace std;

class Stack
{
private:
    
    struct item
    {
        string name;
        int value;
        item* prev;
    };
    
    item* stackPtr;

public:
    
    void push( string name, int value );
    void pop( );
    void readItem( item* r);
    void print( );
    
    Stack();
    ~Stack();
};


#endif /* Stack_h */


//----------------------------

//  Stack.cpp
//  Stack_Class
//
//  Created by Sergiy on 23.02.17.


#include <stdio.h>
#include <cstdlib>
#include <iostream>

#include "Stack.h"

using namespace std;

Stack::Stack()
{
    stackPtr = NULL;
}

Stack::~Stack()
{
    item* p1;
    item* p2;
    
    p1 = stackPtr;
    
    while ( p1 != NULL )
    {
        p2 = p1;
        p1 = p1->prev;
        p2->prev = NULL;
        delete p2;
    }
}

void Stack::push( string name, int value )
{
    item* n = new item;
    
    n->name = name;
    n->value = value;
    
    if ( stackPtr == NULL )
    {
        stackPtr = n;
        stackPtr->prev = NULL;
    }
    else
    {
        n->prev = stackPtr;
        stackPtr = n;
    }
}

void Stack::readItem( item *r )
{
    cout << "\n----------------" << endl;
    cout << "name:   " << r->name << endl;
    cout << "value   " << r->value << endl;
    
    cout << "----------------" << endl;
}

void Stack::pop( )
{
    if (stackPtr == NULL)
    {
        cout << "\nThere is nothing on the stack" << endl;
    }
    else
    {
        item* p = stackPtr;
        readItem(p);
        stackPtr = stackPtr->prev;
        p->prev = NULL;
        delete p;
    }
}

void Stack::print( )
{
    item* p = stackPtr;
    
    while ( p != NULL)
    {
        readItem(p);
        p = p->prev;
    }
}

//-------------------------


//  main.cpp
//  Stack_Class
//
//  Created by Sergiy on 23.02.17.


#include <iostream>
#include <string>
#include <string.h>
#include <cstdlib>

#include "Stack.h"

using namespace std;

int main(int argc, const char * argv[])
{
    Stack Sergio;
    Sergio.push("Sergio", 3);
    Sergio.push("Coffe", 0);
    Sergio.push("Lunch", 0);
    Sergio.push("Videos", 5);
    
    Sergio.print();
    
    cout << "Popping...\n";
    Sergio.pop();
    cout << "Popping...\n";
    Sergio.pop();
    cout << "Popping...\n";
    Sergio.pop();
    cout << "Popping...\n";
    Sergio.pop();
    cout << "Popping...\n";
    Sergio.pop();
    
    cout << "\n\n New stack\n";
    Sergio.push("Books", 100);
    Sergio.push("Pencil", 1);
    
    Sergio.print();
    
    
    return 0;
}