if answer not = integer then?

[Jas]

Im doing a project, and my teacher said you have to make your program error trapped. So, i have a program where the user types an integer, and the program runs, but if he types anything else, it crashes. how do u error trap this? im asking for something like this...

var ans: int
get ans
if answer > 0 then
%continue with program
else ans not = int then
put "invalid input"
end if


the "else ans not = int then" line doesn't work, I just made it up so you will understand what im taking about. so what can i do to this program so it doesn't crash when the user types anything but an integer?

p.s. how do u put the "code" thing on top of your program? I saw other programs that people posted, and they had that word on top of them. why do u need that?

[Mr. T]

[ code][/code ]
put ur code in between those tags. (but without the spaces in the [ ] brackets)

as for your int problem...as far as i know, that wont work because int is an identifier, and ur setting it as a condition. so really i have no solution

[Cervantes]

String manipulation. I just remembered I'm going to write a tutorial on it soon, so if you don't know much about it, look for that.

Turing:

var input : string var num : int get input if strintok (input) then     num := strint (input) end if

[Mr. T]

ok, listen to cervantes, he knows best

[Mazer]

You may also want to put that in a loop with a message to the user, as the rest of the program probably relies on the variable:

Turing:

var input : string var num : int get input loop     exit when strintok (input)     put "Invalid input, please try again:"     get input end loop num := strint (input)

[Jas]

I see how this works. I decided to use something like this:

code:

var input : string var num : int loop     get input     if strintok (input) then         num := strint (input)     else         put "Invalid input"     end if end loop

thx for the help.

[Mazer]

Don't forget to exit the loop once you've got a valid input!

[Naveg]

Jas wrote:

I see how this works. I decided to use something like this:

code:

var input : string var num : int loop     get input     if strintok (input) then         num := strint (input)         exit     else         put "Invalid input"     end if end loop

thx for the help.

there i added a line, dont forget it its important