c++ segmentation fault in card game program

I am pretty new to c++ programming. I am trying to set up a card and deck class. I keep getting a segmentation fault as an error and cant seem to figure out where.

This is my Deck.h

#ifndef _DECK_H
#define _DECK_H

#include "card.h"
#include <stack>

class Deck
{
public:
void initialiseCardDeck(int setNum,Deck deck);
stack <string> st1;
};

#endif

and this is my deck.cpp where i am trying to test if it works. Deck.cpp-

#include "card.h"
#include "deck.h"
#include <stack>
#include <iostream>

using namespace std;

Deck initialiseCardDeck(int setNum,Deck deck)
{
    int i,k;
    for(k=0;k<setNum;k++)
    {
            for(i=1;i<=13;i++)
            {
                    Card c = Card(i,Card::hearts);
                    deck.st1.push(c.toString());
            }
            for(i=1;i<=13;i++)
            {
                    Card c =Card(i,Card::spades);
                    deck.st1.push(c.toString());
            }
            for(i=1;i<=13;i++)
            {
                    Card c =Card(i,Card::diamonds);
                    deck.st1.push(c.toString());
            }
            for(i=1;i<=13;i++)
            {
                    Card c =Card(i,Card::clubs);
                    deck.st1.push(c.toString());
            }
    }
    std::cout<<deck.st1.top();
}


int main()
{
    Deck d;
    d.st1.push("worked");
    std::cout<<d.st1.top();
    initialiseCardDeck(1,d);
}