//---------------------------------------------------------
// Demonstrate rand() and srand().
//---------------------------------------------------------
#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    char ch;
   
    cout << "RAND_MAX = " << RAND_MAX << endl << endl;

    // Display a sequence of 13 random values
    
    for(int i = 0; i < 13; i++)
    {
        cout << setw(6) << rand();
    }
    cout << endl << endl;
    
    // Using the same seed value, display 3 sequences
    // of 13 random values.

    for(int i = 0; i < 3; i++)
    {
        srand(0);
        for(int j = 0; j < 13; j++)
        {
            cout << setw(6) << rand();
        }
        cout << endl;
    }
    cout << endl;
    
    // Using the different seed values, display 3 sequences
    // of 13 random values.

    for(int i = 0; i < 3; i++)
    {
        srand(i);
        for(int j = 0; j < 13; j++)
        {
            cout << setw(6) << rand();
        }
        cout << endl;
    }
    cout << endl;

    // "Randomize" the number generator

    for(int i = 0; i < 3; i++)
    {
        srand(time(NULL));
        for(int j = 0; j < 13; j++)
        {
            cout << setw(6) << rand();
        }
        cout << endl;
        
        cout << "Tap 'Enter' to continue...";
        cin.get(ch);
        cout << endl;
    }
    cout << endl;
    
    // Display values between 0.0 and 1.0 (not including 1.0).
    
    cout << fixed << setprecision(3);
    for(int i = 0; i < 13; i++)
    {
        cout << setw(6) << double(rand())/double(RAND_MAX + 1);
    }
    cout << endl << endl;

    return 0;
}