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

void bw ( int m, int n, int g[m][n] )
{
  char *filename = "picture.pbm";
  int i;
  int j;
  FILE *out;

  out = fopen ( filename, "wt" );

  fprintf ( out, "P1  %i  %i\n", m, n );

  for ( i = m - 1;  0 <= i; i-- )
  {
     for ( j = 0; j < n; j++ )
     {
        fprintf ( out, "  %i", g[i][j] );
     }
     fprintf ( out, "\n" );
  }
  fclose ( out );

  printf ( "The file \"%s\" contains your graphics data.\n", filename );

  return;
}