How to prevent user input error!

[vdemons]

i would like to know how to prevent user input error,
for example;

var inputdelay:int
put "Please enter your disired time delay: "..
get inputdelay

if i initialize it to int and someone enters a string turing will automatically stop the program and pop the code window backup.
my question it if you can prevent that and output an error message and repeat the user input statement.

[Insectoid]

You'll need 2 variables. A string, and an int. get the string, then use strintok() and strint() to convert it to an integer and store it in your integer variable.

[HRI]

Here's a piece of code that will get a string one character at a time, check to see whether it's a number, and then add it if it is. It's easy to set a length too.

Turing:

setscreen ("graphics:max;max,offscreenonly") % max size and simply put, no flickering var ch : string (1) := "" % holds entered character var input : flexible array 1..0 of string (1) % dynamic array of characters var entry : string int delay loop     if hasch % if key was pressed     then         getch (ch) % read key into variable ch             exit when ch = KEY_ENTER % exit if enter key         if ch = KEY_BACKSPACE and upper (input) > 0 % if backspace pressed and there's a character to delete         then             new input, upper (input) - 1 % decrease array size (last character is erased)             put "\b" .. % put a backspace         elsif ord (ch) >= ord ('0') and ord (ch) <= ord ('9') % if another key was pressed between 0 and 9         then             new input, upper (input) + 1 % increase array size             input (upper (input)) := ch % assign highest element to entered character             put ch .. % output entry         end if         View.Update % update screen     end if end loop for i:1..upper (input) % move characters from array to string     entry (i) := input (i) end for delay := strint (entry) % convert string to integer

The reason I do it this way is because I simply don't know of a way to accomplish

Turing:

var a : string := "abc" a -= "c" %or a -= 1

Please give me a shout if you do :3

Alternatively, basically the last post put into code

Turing:

var entry : string var delay := int loop    get entry    exit when strintok (entry) = true end loop delay := strint (entry)

I like the first way better because it doesn't allow other characters than numbers period, but the second works too.