SC: verifying user input to be a number - HOW?

[autocart]

Hi all,
How would one go about verifying user input - function: input(topic, [notes], [default], [style=s|m|w], [cancel], [width=600], [height=400]) - to see whether the return value, which obiously is a sting, represents an integer number and has no other chars in it? It seems that XY-scripting does not offer a simple method to do that, or did I overlook something? Thx in advance.
Regards, Stephan

[bdeshi]

Code: Select all

 set $num;
 while ($num UnLikeI "[0-9]") || (strlen($num) != 1){
  $num = input("Enter a single numerical character","Or face the horror or the Ever-looping Inputbox!!",,s,"CancelIsNotAnEscape");
 }

With the first second condition of while you can even enforce a particular number of numbers.

EDITed out an embarrassing mistake in the snippet.

[autocart]

Thank you, Sammay,
I am glad that I overlooked something, namely the like / unlike operator.

[autocart]

However, it only works with a fix number of chars.
It is not flexible to work with "2 or "22" or "222" or "2222" or ....

[highend]

Code: Select all

  $input = input("Enter a numerical character");
  $onlyNumber = regexmatches($input, "^\d+$");
  if ($onlyNumber) {
      text "yeah!";
  }

Even if you add a space to the input it won't trigger anymore...

[autocart]

Code: Select all

  $input = input("Enter a numerical character");
  $onlyNumber = regexmatches($input, "^\d+$");
  if ($onlyNumber) {
      text "yeah!";
  }

Perfect, thx, highend

[binocular222]

easyway:

Code: Select all

	$input = input("Enter a numerical character");
  if($input == 0  OR  $input * 1 != 0) {echo Number}; Else {echo Text}

[autocart]

easyway:

Code: Select all

	$input = input("Enter a numerical character");
  if($input == 0  OR  $input * 1 != 0) {echo Number}; Else {echo Text}

yep, seems to work also. thx, bino
actually I did think of that in a similar way at first, but discarded the idea w/o trying because in comparisons (like 1 < "a", which results into 1 respectively "true") the string is (obviously) "turned into" a number.
Plus the help file says:

Strings are converted to numbers as possible (just like in comparisons).
$a=""; $b="2"; echo $a + $b; // = 2
$a="1a"; $b="2b"; echo $a + $b; // = 3

So I wrongly concluded that it would be the same with multiplication.

BTW, as I just found out (by trying it out): The help file is wrong in this point. The result in this example is not 3 but 0.

EDIT:
actually the help file says about comparisions:

Strings and Numbers

If you compare two numerical strings, they are compared as integers:

msg ("2" < "10"); // -> true! (both parts are numeric)

msg ("2" < "10a"); // -> false! (only one parts numeric)

msg ("2a" < "10a"); // -> false! (both parts are non-numeric)

Which is weird, since 1 < "1a" results into 1 resp. "true". But 2 < "1a" results into 0 resp. "false". WEIRD!!!!!!

[PeterH]

actually the help file says about comparisions:

Strings and Numbers

If you compare two numerical strings, they are compared as integers:

msg ("2" < "10"); // -> true! (both parts are numeric)

msg ("2" < "10a"); // -> false! (only one parts numeric)

msg ("2a" < "10a"); // -> false! (both parts are non-numeric)

Which is weird, since 1 < "1a" results into 1 resp. "true". But 2 < "1a" results into 0 resp. "false". WEIRD!!!!!!

I think that's OK: it's a string compare, that is character for character, left to right, up to the first difference.
so 1... is always < than 2..., no matter what follows 1st character.
2 is > 10a because 2 > 1

So all correct?

[autocart]

i somehow makes sense what you say, Peter. Thx.
Then, in a comparison of "real" number against non-numeric string, is the "real" number converted into a string? Obiously yes, or am I wrong?

I dunno why this is so confusing to me these days. Sorry to all, for cluttering the forum.

[PeterH]

Then, in a comparison of "real" number against non-numeric string, is the "real" number converted into a string? Obiously yes, or am I wrong?

I'd expect just the opposite: generally all variables are strings, and handled like that.
For a compare both are tested: do they just represent numbers? If yes for both they are converted and compared numerically. Else string-compare is done.

(I hope it's just as I say... )