C15 Answer

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

/* Puzzle C15 -- print every N'th element in an integer array,
   starting with element 0 */

void printSkipNArray( int arr[], int size, int skip )
{
  const int N = 10;
  int j;
  
  for ( j=0; j < size; j+=skip )
  {
    if ( (j/skip)%N == N-1 )
      printf("%4d\n", arr[j] );
    else
      printf("%4d ", arr[j] );
  }
}

void fillArrayInOrder( int arr[], int size )
{
  int j;
  
  for ( j=0; j < size; j++ )
  {
    arr[j] = j;
  }
}

int main(int argc, char *argv[])
{
  const int SIZE = 100;
  int x[ SIZE ];
  
  fillArrayInOrder( x, SIZE );
  printSkipNArray( x, SIZE, 3 );
    
  printf("\n\n");
  system("PAUSE");	
  return 0;
}