I am confused by a piece of code found in a function I am studying:
char GetCommand( void )
{
char command;
do {
printf( "Enter command (q=quit, n=new, l=list): " );
scanf( "%c", &command );
Flush();
}
while ( (command != 'q') && (command != 'n')
&& (command != 'l') );
printf( "\n----------\n" );
return( command );
}
void Flush( void ) {
while ( getchar() != '\n' )
;
}
What I don't quite understand here is the usage of the Flush()
function. I mean, the book I am reading explains it by saying that it prevents the user from inputting more than a single character and then having that character read when they are prompted for input the 2nd time.
What I don't understand is how Flush()
is preventing this from happening. It doesn't DO anything. All it is is a while
command. (While this is true......what?????) Doesn't make sense.