# Stack Question

Hi,

I have to convert a number (integer) to binary.  If I use the following code...

**************************************************************************
#include <iostream.h>
#include <conio.h>
#include <windows.h>

void main()
{

int number = 0;
int digit = 0;
int convert = 0;
int choice = 0;
bool exit = false;

do {
do {
cout << "1) Convert an integer to binary" << endl;
cout << "2) Exit" << endl;
cin >> choice;
system("cls");
} while (choice != 1 && choice != 2);

switch (choice) {

case 1:
cout << "Please enter a number: ";
cin >> number;
cout << endl;

while (number > 0) {
digit = number % 2;
cout << digit;
number = number/2;
}

cout << endl << endl;
cout << "Press any key to continue..." << endl;
getch();
system("cls");
exit = false;
break;

case 2:
exit = true;

}
} while (!exit);

}

**************************************************************************

This will produce a backwards binary value.  I need to use a stack to convert it.  I have the following header file...

**************************************************************************
#ifndef S__H__
#define S__H__

#include <list>
//necessary for specifying to use standard headers provided
using namespace std;

template <class bd>
class Stacks: protected list<bd>
{public:
Stacks ();
~Stacks ();
void push(bd);
void pop();
bd top();
bool emptyS();
bool fullS();
};

template <class bd>
Stacks<bd>::Stacks(){}

template <class bd>
Stacks<bd>::~Stacks(){}

template <class bd>
void Stacks<bd>::push(bd item)
{
if(!fullS())
push_front(item);
}

template <class bd>
void Stacks<bd>::pop()
{
if(!emptyS())
{      iterator i = begin();
erase(i);
}
}

template <class bd>
bd Stacks<bd>::top()
{
iterator i = begin();
return *i;
}

template <class bd>
bool Stacks<bd>::emptyS()
{return empty();}

template <class bd>
bool Stacks<bd>::fullS()
{
//number of items in list
//== maximum number
return size() == max_size();
}

#endif
**************************************************************************

Does anyone have any ideas on how to do it (using the header file)?  Thanks.

NeoTek
LVL 1
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Commented:
Hi, of course it is much easier to reverse your output, BUT if you HAVE to use the provided header file then change your main() to:

void main()
{

int number = 0;
int digit = 0;
int convert = 0;
int choice = 0;
bool exit = false;
Stacks<int> stack;

do {
do {
cout << "1) Convert an integer to binary" << endl;
cout << "2) Exit" << endl;
cin >> choice;
system("cls");
} while (choice != 1 && choice != 2);

switch (choice) {

case 1:
cout << "Please enter a number: ";
cin >> number;
cout << endl;

while (number > 0) {
digit = number % 2;
//cout << digit;
stack.push(digit);
number = number/2;
}
while(!stack.emptyS()) {
cout << stack.top();
stack.pop();
}

cout << endl << endl;
cout << "Press any key to continue..." << endl;
getch();
system("cls");
exit = false;
break;

case 2:
exit = true;

}
} while (!exit);

}
0

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ProgrammerCommented:
hi ,
you can use STL for stack,
using

#include "stack"
using namespace std;

and then, for example :

stack<int> st;
st.push(10);
st.push(12);
....

cout << st.top() << endl;

st.pop();

have a good programming day.

0
Commented:
same thing...
remember to put :
>> cout << st.top() << endl;

>> st.pop();
in a while
0
ProgrammerCommented:
hi HendrikTYR,

the code above is only an example for using the satck class.

have good push and pop. ;)
0
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