random_shuffle() Function in C++

This C++ program demonstrates the random_shuffle() algorithm. The function random_shuffle() shuffles the elements of a container in a uniformly random manner. The function takes two iterators to the beginning and end of the container as parameters. The program creates a set of cards, randomly shuffles and randomly opens three cards from the set.

Here is the source code of the C++ program which demonstrates the random_shuffle() algorithm. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to demonstrate the random_shuffle() algorithm

```
 */
```
```
#include <iostream>
```
```
#include <algorithm>
```
```
#include <vector>
```
```
#include <iomanip>
```
```
using namespace std;
```
```
 
```
```
void print(vector <string> vs)
```
```
{   
```
```
    vector <string>::iterator i;
```

    for(i = vs.begin(); i != vs.end(); i++)

```
    {
```
```
        cout << setw(2) << *i << "  ";
```
```
    }
```
```
    cout << endl;
```
```
}
```
```
 
```
```
int main()
```
```
{
```

    string s[] = {"A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"};

```
    vector <string> vs(s, s + 13);
```
```
 
```
```
    cout << "Original order : ";
```
```
    print(vs);
```

    cout << "Shuffling cards in uniformly random order ... "

```
         << endl;
```

    random_shuffle(vs.begin(), vs.end());

    cout << "Pick any three cards ... " << endl;

```
    cout << "You have got   : ";
```
```
    cout << vs.back() << ", ";
```
```
    vs.pop_back();
```
```
    cout << vs.back() << ", ";
```
```
    vs.pop_back();
```
```
    cout << vs.back() << endl;
```
```
    vs.pop_back();
```
```
}
```

$ a.out
Original order :  A   2   3   4   5   6   7   8   9  10   J   Q   K  
Shuffling cards in uniformly random order ... 
Pick any three cards ... 
You have got   : 9, 8, 4