// This program demonstrates the use of the random number generator
//
// Run it and look at the output carefully
//
// AUTHOR: Jim Etheredge
//
// 

#include <iostream>
//#include <ctime>     // This is where the time functions are.
//#include <cstdlib>
using namespace std;

const int SIZE = 5;

int main()
{
  int arr[SIZE][SIZE] = {{0}};
  int randRow, randCol;

  srand((unsigned)time(NULL));           // Seed the random number generator.
                                         // Do this only once for each set of 
                                         // random numbers. For normal use
                                         // the seed value doesn't matter much.

  // Let's do this 8 times 
  for(int howMany = 0; howMany < 8; howMany++)
  {
     // rand() returns integers between 0 and RAND_MAX (VERY LARGE)
     // so we scale them to fit 
     randRow = rand() % SIZE;                // Generate a random row
     randCol = rand() % SIZE;                // Generate a random column

     if(arr[randRow][randCol] == 0)          // If there isn't a number there,
       arr[randRow][randCol] = howMany + 1;  // put a number there.

     // Print out the array so we can see the changes
     for(int i = 0; i < SIZE; i++)
     {
       cout << "| ";
       for(int j = 0; j < SIZE; j++)
          cout << arr[i][j] << ' ';
       cout << '|' << endl;
     }                                  // End of print loop
     cout << "-------------" << endl;   // This line needs some work. Why?
  }                                     // End of outer loop
}                                       // End of program