Need help with program templating

[Comedian]

I need to be able to input either a int or string and perform several different actions that are mentioned in the case switch down below. I am not sure what I am doing wrong completely and I've gotten it close to working a few times I think. I would really appreciate any help.

#include <iostream>
//#include "Stack"
#include <string>
#include <cstdlib>
#define SZ 10000

using namespace std;

template <class T>
class STACK
{
private:
	T num[SZ];
	T top;
	int ze;
public:
	STACK(); //default constructor
	T push(int); // will push items
	T pop(); // will pop items
	T popBack(); //will pop item at back of stack
	T peek(); // will peek
	T isEmpty(); // will check if stack is empty
	T displayItems(); // will display items user has entered
};

template <class T>
STACK<T>::STACK()
{
	top = -1;
}

template <class T>
T STACK<T>::isEmpty()
{
	if (top == -1)
		return 1;
	else
		return 0;
}

template <class T>
T STACK<T>::push(int n)
{
	++top;
	num[top] = n;
	return n;
}

template <class T>
T STACK<T>::pop()
{
	//to store and print which number is deleted
	T tem;
	//check for empty
	if (isEmpty())
		return 0;
	tem = num[top];
	--top;
	return tem;
}

template <class T>
T STACK<T>::popBack()
{
	//to store and print which number is deleted
	T tem;
	//check for empty
	if (isEmpty())
		return 0;
	tem = num[top];
	++top;
	return tem;
}

template <class T>
T STACK<T>::peek()
{
	
	if(isEmpty())
	{
		cout << "The stack is empty" << endl;
		return NULL;
	}
	else
	{
		return top == num;
	}
		
}

template <class T>
T STACK<T>::displayItems()
{
	int inc; //for loop

	cout << "Stack is ";

	for (inc = (top); inc >= 0; inc--)
		cout << num[inc] << " " << endl;
}

//Main has int argc and charargv(might or might not work)
int main()
{
	//declare object stack for class Stack
	//int that will be used online in main
	STACK <T> staack;
	int userChoice;
	T userInput;
	T tem;

	do
	{
		//These are the first lines of code that will be prompted to the user
		cout << "Welcome to this simple push, pop, peek program" << endl;
		cout << "Push Item(3 max) => 1" << endl;
		cout << "Pop Item(s) => 2" << endl;
		cout << "Pop last item from stack => 3" << endl;
		cout << "Peek Item at top of stack = > 4" << endl;
		cout << "Display Items => 5" << endl;
		cout << "Exit the Program => 6" << endl;
		cout << "Enter your choice: " << " "<< endl;
		cin >> userChoice;

		//switch and case are the easiest options for any user
		// choice menu and the single number being entered makes
		// it easier.
		switch (userChoice)
		{
		case 1:
			cout << "Enter number to insert: ";
			getline(cin, userInput);
			tem = staack.push(userInput);
			if (tem == 0)
				cout << "Stack is full" << endl;
			else
				cout << "The number "<< tem << " inserted" << endl;
			break;

		case 2:
			tem = staack.pop();
			if (tem == 0)
				cout << "STACK IS EMPTY." << endl;
			else
				cout << "The number "<< tem << " is removed." << endl;
			break;

		case 3:
			tem = staack.pop_back();
			if (tem == 0)
				cout << "STACK IS EMPTY." << endl;
			else
				cout << "Last element "<< tem << " from stack popped" << endl;
			break;

		case 4:
			cout << "Feature not ready yet" << endl;
			tem = staack.peek();
			break;

		case 5:
			staack.displayItems();
			break;

		case 6:
			//exit();
			break;

		default:
			cout << "This choice is invalid, try another one" << endl;
		}
	} while (userChoice != 0);

	return 0;
}[code]

[/code]

[salem c]

1. Use code tags when you post code.
http://www.cplusplus.com/articles/jEywvCM9/

> STACK <T> staack;
> int userChoice;
> T userInput;
> T tem;
In your templates, T is just a placeholder name for some type as yet to be specified.

When you want an actual stack, you say what type you want.
So to get a stack of int's.

STACK <int> staack;
int userChoice;
int userInput;
int tem;

[Comedian]

What if I want the user to be able to input either a int or string?
would I just have to give the user the option to enter a string or int?

[deleted account xyzzy]

#include <iostream>
#include <string>

int main()
{
   std::string input { };

   std::cout << "Enter a number or a word: ";
   std::getline(std::cin, input);
   std::cout << '\n';

   std::cout << "You entered: " << input << '\n';

   try
   {
      std::stoi(input);
      std::cout << "You entered a number.\n";
   }
   catch (...)
   {
      std::cout << "You entered a string.\n";
   }
}

Enter a number or a word: one

You entered: one
You entered a string.

Enter a number or a word: 127

You entered: 127
You entered a number.

[mbozzi]

OP, see this thread:

http://www.cplusplus.com/forum/beginner/258632/