Function calls

[cpluspluser]

Good Evening!

Having some trouble getting the folowing program to function properly. It compiles perfectly, but does not seem to be functioning. Essentially, the code is supposed to create a virtual combination lock. The lock combo can be reset, the lock can be locked or unlocked, and a new combo can be created.

When I call my lock function(which locks the virtual lock) and then call my isLocked function(which returns 1 if locked and 0 if not), nothing is returned to the console window.

Any idea why?

-----

Also a quick CString question.
If I've got a
char combination[6];
Can I not just assign a value to it like this:
combination = "testtt";


Here's the app:

#include <iostream>
#include <iomanip>
#include <string>
#include <cstdlib>

using namespace std;

class ElectronicLock
{
protected:
	char combination[6];
public: 
	void getCombination()
	{
		cout << "Enter the combination:";
		cin >> combination;
	}

	void putCombination()
	{
		cout << "You entered the combination:"
			 << combination;
	}

	virtual void reset() = 0;
	virtual int isLocked() = 0;
	virtual void openLock(char combo[]) = 0;
	virtual void newCombination(char combo[]) = 0;
	virtual void lock() = 0;
};
 
class LockSimulator : public ElectronicLock
{
private:
	bool locked;
public:
	void reset()
	{
//		combination = "reset";
	}

	int isLocked()
	{
		if(locked == true)
		{
			return 1;
		}
		else
		{
			return 0;
		}
	}

	void openLock(char combo[])
	{
		if(stricmp(combo,combination) == 0)
		{
			locked = false;
		}
	}

	void newCombination(char combo[])
	{
/*
		int intCombo = atoi(combo);
		
		for(int i = 0; i < 6;i++)
		{
			if(isdigit(intCombo))
			{
			combination = combo;
		}
*/
	}

	void lock()
	{
		locked = true;
	}
};

int main()
{
	bool done = false;
	LockSimulator ls;
	int choice;
	char combo[6];
	char newCombo[6];

	while(!done)
	{
		cout << "Enter a selection:" << endl
			 << " 1 - Lock" << endl
			 << " 2 - Unlock" << endl
			 << " 3 - Reset" << endl 
			 << " 4 - New Combination" << endl
			 << " 5 - Is Locked?" << endl
			 << " 6 - Exit" << endl;

		cin >> choice;

		switch(choice)
		{
			case 1:
				ls.lock();
				break;
			case 2:
				cout << "Enter a valid combination:" << endl;
				cin >> combo;
				ls.openLock(combo);
				break;
			case 3:
				ls.reset();
				break;
			case 4:
				cout << "Enter a new numeric combination:" << endl;
				cin >> newCombo;
				ls.newCombination(newCombo);
				break;
			case 5:
				ls.isLocked();
				break;
			case 6:
				done = true;
				break;
		}
	}
	return 0;
}