Testing strings/floats/ints

[shanesparks]

Does anyone know how to test for the validity
of a string, float or int without producing an error
if not a valid test. We can test for validity of a list
with listp, but when we try to test with something
like strcat for a string it will crash if fed a real.

Maybe there is something easy, but I have not found it
yet.

Shane

 

[michael puckett]

It's tempting to write code for you, but generally speaking, you should know the data type you are dealing with and use it accordingly rather than relying on a convert all function like vl-princ-to-string.

A starter might be to look / read up on the lisp functions -- type, itoa, rtos, vl-princ-to-string, vl-symbol-name ...

Cheers.

 

[CJ Follmer]

try the function TYPE to check what a variable is.

cj