UGN Security Forums UGN Security: Knowledge Base Programming C/C++ A pretty easy c++ question regarding program output

using namespace std;

#include <iostream>
#include <cstdlib>
#include <cctype>
#include <string>

#include "dstack.h"
#include "integer.h"

int main()
{
    Stack values;
    
    string command;
    
    while (cin >> command && command != "q")
    {
        if (isdigit(command[0]))
        {
            int input = atoi(command.c_str());
            Integer wrapper(input);
            values.push(wrapper);
        }
        else
        {
            Integer x;
            Integer y;
            
            switch (command[0])
            {
            case '+':
                values.pop(x);
                values.pop(y);
                values.push(Integer(y.intValue() + x.intValue()));
                break;
            
            case '-':
                values.pop(x);
                values.pop(y);
                values.push(Integer(y.intValue() - x.intValue()));
                break;
            
            case '*':
                values.pop(x);
                values.pop(y);
                values.push(Integer(y.intValue() * x.intValue()));
                break;
            
            case '/':
                values.pop(x);
                values.pop(y);
                values.push(Integer(y.intValue() /  x.intValue()));
                break;
            
            case 'p':
                values.pop(x);
                x.writeToFile(cout);
                values.push(x);
                cout << endl;
            }
        }
    }
}