int rename ( const char * oldname, const char * newname );
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/* rename example */
#include <stdio.h>
int main ()
{
int result;
char oldname[] ="oldname.txt";
char newname[] ="newname.txt";
result= rename( oldname , newname );
if ( result == 0 )
puts ( "File successfully renamed" );
else
perror( "Error renaming file" );
return 0;
}File successfully renamed
Error renaming file: Permission denied