Thread: nested if-else forgot how to clear scanf

Can someone please help me jog my memory? It's been a long time since I used C, but I had this problem once before. I figured it out then, but I've forgotten what I did to do so and now it's driving me crazy. Anyway, my problem is when using the same variable in a nested if else.

char choice;

blah

if(sentinel == -1)
{
blah
scanf("%c", &choice);

if(choice != 'y')
{
blah
}

here is the stickler

else
{
blah
scanf("%c", &choice);

switch(choice)
{
blah
}

All of this is inside the first if statment. My code does not do what I intended I guess because either choice still is clinging onto its first value or scanf has null in it or something. It must be scanf since the same thing happens even if I use another variable in the second scanf. Any ideas are greatly appreciated.

TIA

Here's a novel ideal! Don't use scanf. Use fgetc or something similar.

Quzah.

Ok I'll look into that too, but I found it,

_flushall()

Thanks for the reply quzah.

The thing about fflushall is that it isn't an ANSI function. This may be no big deal to you, in which case, go ahead and use it.

Another option is:

void flushstdin( void ) { while( fgetc( stdin ) != '\n' ); }

Basicly you then use:

choice = fgetc( stdin );
fflushstdin( );

Quzah.

Well I'm using an old version of Microsoft C / CPP for dos 1992 ish. fgetc in that version is used for file i/o, which I'll be working with later in the program. Right now I'm just writing a few inline assembler functions for clearing the screen and cursor control. That is why I was using printf instead of cout and that scanf stuff. Cout wouldn't allow me to set the cursor but once. I might need to check into that. : )

Thanks for this new tip!! I'll paste it into a text file.