How to use it. 1  Open Excel & VBA editor 2  (+) Insert the code below under Sheet1. 3  Go back to Excel and select your desired range to fill with random & non-repeating numbers.  Execute the macro (+)
See also What are the rules about using an underscore in a C++ identifier; a lot of the same rules apply to both C and C++, though the embedded double-underscore rule is in C++ only, as mentioned at the top of this answer. Names with double leading underscores are reserved for use by the implementation.
ninja is correct that an underscore is a legal character, but it should not be interpreted as a substitute for a hyphen. That is, if the correct email address has a hyphen, substituting an underscore should not work since both hyphens and underscores are legal characters.osts: 20,938. The underLINE you're seeing with the email address is either because it is a link on a webpage/email, or because it has been underlined in HTML-the underline is NOT part of the actual address that you have to fill in.