在c语言中怎样打开一个文本文档

#include <stdio.h>

FILE *stream, *stream2;

void main( void )
{
int numclosed;

/* Open for read (will fail if file "data" does not exist) */
if( (stream = fopen( "data", "r" )) == NULL )
printf( "The file 'data' was not opened\n" );
else
printf( "The file 'data' was opened\n" );

/* Open for write */
if( (stream2 = fopen( "data2", "w+" )) == NULL )
printf( "The file 'data2' was not opened\n" );
else
printf( "The file 'data2' was opened\n" );

/* Close stream */
if( fclose( stream ) )
printf( "The file 'data' was not closed\n" );

/* All other files are closed: */
numclosed = _fcloseall( );
printf( "Number of files close