Find a Missing ISBN Number

Category:
Miscellaneous
Type:
Snippets
Difficulty:
Beginning
Author:
Rob S

Version Compatibility: Visual Basic 6

More information:
This snippet will find a missing ISBN number and determine if an ISBN number is valid. The missing character should be replaced with a '?', the ISBN number may only contain characters 0-9, 'X' (the value of 10) and '-'.

Instructions: Copy the declarations and code below and paste directly into your VB project.

Declarations:

Code: