Append successive Letters onto the end of a string

[BobChuck]

I'm trying to create a simple subVI that appends the next letter (A,B,etc) to a string, and removes the previous one if possible.

Input: a string. The base string will always consist of a series of letters followed by a series of numbers, but the subVI may be called multiple times

I don't know how to check if the last position in the string is a 'letter' as opposed to a 'number', and I'm not sure how to increment a letter in LabVIEW.

This is the first coding situation I've reached where the solution seems more obvious in C++ or Java than in LabVIEW.

[unclebump]

It might be easier to switch the string into byte arrays. Add one to the last character.

[BobChuck]

Thank you! It increments the letter, which is what I needed. I can use Lexical Class on the last digit of the string and check if it is equal to 4 to find out if there is already an uppercase letter on the end.