copy file

beginner C

How can i copy an existent file content to a new file that I have to create

K&R page 171.

k thx bye.

Code:

---

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

int main ( void )
{
  size_t len;
  FILE *in, *out;
  char buf[BUFSIZ];

  if ( ( in = fopen ( "datain.txt", "rb" ) ) != NULL ) {
    if ( ( out = fopen ( "dataout.txt", "wb" ) ) != NULL ) {
      do {
        len = fread ( buf, 1, sizeof buf, in );
        if ( len != 0 )
          fwrite ( buf, 1, len, out );
        /*
        ** This would be a good place to check for errors.
        */
      } while ( len == sizeof buf );
      fclose ( out );
    }
    else
      perror ( "File open failure: output" );
    fclose ( in );
  }
  else
    perror ( "File open failure: input" );

  return EXIT_SUCCESS;
}

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-Prelude