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Thank you very much kiruthika_sri for your answer

I thank all people for helping me. And thanks for your suggestions, I have found the solution (using "freopen" and "fseek")

Hello,
I would like to conditionaly comment in my code source some fields from arrays. So I use the property ## from the #define definition.
my code:
...
#define slet /##*
#define etsl *##/
......

Thank you Binlib for your answer.
But my problem is not solved. I added this in my code:

int pFile = -1;
pFile = open("/dev/tty",O_RDONLY);
if (pFile == -1)
printf("échec sur ouverture...

Hello,
my C application under unix runs in redirecting stdin to a file.
Example:$appli1 <file1. This application waits often on a scanf().
But I would temporarely reassign stdin at the keyboard...

Bonjour,
Mon application en C sous linux tourne en redirigeant stdin vers un fichier.
Exemple; $appli1 <file1.
[Cette appli s'arrête donc régulièrement sur un scanf();]
PB: Je voudrais temporairement...