/**
 * diamond - Make and print a simple diamond from asterisks.
 */

// +---------+--------------------------------------------------------
// | Headers |
// +---------+

#include <stdio.h>
#include <stdlib.h>


// +------+-----------------------------------------------------------
// | Main |
// +------+

int
main (int argc, char *argv[])
{
  int side;     // The length of the side
  int row;      // A count of the rows we're printing
  int i;        // A counter variable

  // Verify that there are enough arguments
  if (argc != 2)
    {
      printf ("Usage: diamond SIDE\n");
      return 1;
    }

  // Determine the side length
  side = atoi (argv[1]);

  // Validate the side legth
  if (side <= 0)
    {
      printf ("Invalid side length: %s\n", argv[1]);
      return 2;
    }

  // Print the top half
  for (row = 0; row < side; row++)
    {
      // Print the spaces in the row
      for (i = 0; i < side-1-row; i++)
        putchar (' ');
      // Print the asterisks
      for (i = 0; i < 2*row+1; i++)
        putchar ('*');
      // That's it for the line
      printf ("\n");
    } // for lines in top half

  // Print the bottom half
  for (row = side-2; row >= 0; row--)
    {
      // Print the spaces in the row
      for (i = 0; i < side-1-row; i++)
        putchar (' ');
      // Print the asterisks
      for (i = 0; i < 2*row+1; i++)
        putchar ('*');
      // That's it for the line
      printf ("\n");
    } // for lines in bottom half

  // And we're done
  return 0;
} // main