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

int main ( )
{
  int a[5][3];
  int b[5][3];
  int c[5][3];
  int i;
  FILE *input;
  int j;
  FILE *output1;
  FILE *output2;
//
//  Read the input file.
//
  input = fopen ( "input.txt", "rt" );

  for ( i = 0; i < 5; i++ )
  {
    for ( j = 0; j < 3; j++ )
    {
      fscanf ( input, "%i", &a[i][j] );
    }
  }
  fclose ( input );
//
//  Print the data to make sure we got it.
//
  printf ( "\n" );
  printf ( "Input data A:\n" );
  printf ( "\n" );

  for ( i = 0; i < 5; i++ )
  {
    for ( j = 0; j < 3; j++ )
    {
      printf ( "  %2i", a[i][j] );
    }
    printf ( "\n" );
  }
//
//  Copy A into B, but modify one entry.
//
  for ( i = 0; i < 5; i++ )
  {
    for ( j = 0; j < 3; j++ )
    {
      b[i][j] = a[i][j];
    }
  }
  b[2][3] = 7;
//
//  Write B to OUTPUT1.
//
  output1 = fopen ( "output1.txt", "wt" );

  for ( i = 0; i < 5; i++ )
  {
    for ( j = 0; j < 3; j++ )
    {
      fprintf ( output1, "  %2i", b[i][j] );
    }
    fprintf ( output1, "\n" );
  }

  fclose ( output1 );
//
//  Copy A into C, but modify one entry.
//
  for ( i = 0; i < 5; i++ )
  {
    for ( j = 0; j < 3; j++ )
    {
      c[i][j] = a[i][j];
    }
  }
  c[1][0] = 3;
//
//  Write C to OUTPUT2.
//
  output2 = fopen ( "output2.txt", "wt" );

  for ( i = 0; i < 5; i++ )
  {
    for ( j = 0; j < 3; j++ )
    {
      fprintf ( output2, "  %2i", c[i][j] );
    }
    fprintf ( output2, "\n" );
  }

  fclose ( output2 );

  return 0;
}