dev-cpp-users

[Dev-C++] C validating user input

[Dane E. <dg...@wo...>]

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

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

[Daniel K. O. <dan...@ya...>]

Dane Ensign wrote:

> What is the safest approach?

(...)

> 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.


Read the scanf() documentation to see what the returned value means. 
It's enough for your simple input.


Daniel K. O.