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key9 wrote:
> Hi all
>
> I want to use
>
> #define KEY_RETU "\n"
> #define KEY_BKS  "\b"

No, you don't. You've already discovered why.

> and use
>
> int ch_;
>
>      switch(ch_){
>      case KEY_RETU :
[snip]
> so how to define it?


Try

#define KEY_RETU '\n'
..
int ch;
switch(ch)
{
case KEY_RETU:
..

HTH

- --
Lew Pitcher

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