RE: [Dev-C++] C validating user input

[<Mat...@Ve...>]

make user enter number as string
then turn string into number with strtol function
strtol will check out the validity for you, but if something goes wrong it's
allowed to return certain error values. read the man page for it from Google
and be sure to catch whatever error conditions are listed and you should be
ok.

HTH!
Matt

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...]On Behalf Of Dane
Ensign
Sent: Tuesday, March 15, 2005 3:34 PM
To: DEV C++ list
Subject: [Dev-C++] C validating user input


Hi all,

Using 'C' I need to prompt the user to enter an integer. Then I need to 
check if it is between 0-18.
What is the safest approach?


I tried:

int Num;
printf("Enter a value between 0 and 18: ");
scanf("%d", &Num);

if(Num > 0 && Num <= 18)...

but that makes the app go nuts if they enter: '.4' or something stupid 
like that.

Thank you in advance for any help you can offer.

Dane





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