#include <stdio.h>
 
void display_grid( char** g );
 
int i, j;
 
int main( void ) {
 
   char grid[12][12];
 
   display_grid( &grid[0][0] );
 
   return 0;
}
 
void display_grid( char** g ) {
 
   for( i = 0; i < 12; i++ ) {
      for( j = 0; j < 12; j++ ) {
         g[i][j] = 'O';
      }
   }
 
   for( i = 0; i < 12; i++ ) {
      for( j = 0; j < 12; j++ ) {
 
         if( j % 2 == 1 ) {
            g[i][j] = 'X';
         }
 
         printf( " %c ", g[i][j] );
      }
 
      printf( "\n" );
   }
}