How to Shuffle Cards in Card Game using C++ in OOP

#include<iostream>
#include<conio.h>
#include<ctime>
#include<stdlib.h>
using namespace std;
enum Suit {clubs,diamonds,hearts,spades};
const int jack=11;
const int queen=12;
const int king=13;
const int ace=14;
/*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/
class card{
int number;
Suit suit;
public:
void set(int n,Suit s){
number=n;
suit=s;}
void display();
};
/*$$$$$$$$$$$$$%%%%%%%%%%@@@@@@@@@#@@%$@%@$@#$*/
void card::display()
{
if(number>=2&&number<=10)
cout<<number;
else
switch(number){
case jack:  cout<<"J"; break;
case queen: cout<<"Q"; break;
case king: cout<<"K"; break;
case ace: cout<<"A"; break;
}
switch(suit){
case clubs: cout<<char(5); break;
case diamonds: cout<<char(4); break;
case hearts: cout<<char(3); break;
case spades: cout<<char(6); break;
} }
/*#############################*/
int main(){

card deck[52];
int j;
cout<<endl;
    for(j=0;j<52;j++){
    int num=(j%13)+2;
    Suit su=Suit(j/13);
    deck[j].set(num,su);       }
    cout<<"\n Ordered deck:\n";
          for(j=0;j<52;j++){
          deck[j].display();
                   cout<<"     ";
                   if(!((j+1)%13))
                   cout<<endl;
                   }
             srand(time(0));
                   for(j=0;j<52;j++){
                                    
                   int k =rand()%52;
                   card temp=deck[j];
                   deck[j]=deck[k];
                   deck[k]=temp;}
                cout<<"\n  shuffled  deck:\n";
            for(j=0;j<52;j++)
            {
            deck[j].display();
            cout<<"       ";
            if(!((j+1)%13))
            cout<<endl; }
            system("pause");
            getch();
            }