/*
  files.c

  demonstrates simple file I/O in C

*/


#include <stdio.h>

main() {

  FILE *fp;
  char buf[1024];

  // open file for writing
  if (( fp = fopen( "myfile.dat","w" )) == NULL ) {
    perror( "error opening myfile.dat" );
    exit( 1 );
  }

  // write message to file
  fprintf( fp,"hello file!\n" );

  // close file
  fclose( fp );

  // open file for reading
  if (( fp = fopen( "myfile.dat","r" )) == NULL ) {
    perror( "error opening myfile.dat" );
    exit( 1 );
  }

  // read first word in file
  fscanf( fp,"%s",buf );

  // output first word to the screen
  printf( "buf=[%s]\n",buf );

  // close file
  fclose( fp );

} // end main()