check variable type

[r0n]

1)
How can I check what type a variable is?
example
Macro Macro9

Code:

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ARRAY(int) i

;.
;. code
;.

out "i is 'ARRAY'"

2)
I want to check if file names or folder names end with a number.
I have this code
Macro Macro8

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str check_string="test_name0"
get_last_char(check_string)
int x=val(check_string)
out x

whith this function
Function get_last_char

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/

function str&check_string

str char
int q=len(check_string)
char.get(check_string q-1 1)

check_string=char

The problem is that the string "check_string" contains a string that ends with '0' (zero).
The 'val' command returns a zero if number is to big or it is not a number.
If I had a string that was "setup_v1.0" the "out x" would result in 0 in the output window.
But how do I know that zero is based on error or actually based on integer value zero?