传送格式化输出到一个流中

[c]代码库

#include <stdio.h>

int main ( void )
{
	FILE *in, *out;

	if ( ( in = fopen ( "\\AUTOEXEC.BAT", "rt" ) )
	        == NULL )
	{
		fprintf ( stderr, "Cannot open input \
       file.\n" );
		return 1;
	}

	if ( ( out = fopen ( "\\AUTOEXEC.BAK", "wt" ) )
	        == NULL )
	{
		fprintf ( stderr, "Cannot open output \
       file.\n" );
		return 1;
	}

	while ( !feof ( in ) )
		fputc ( fgetc ( in ), out );

	fclose ( in );
	fclose ( out );
	return 0;
}