What is the difference between Sub and Function in VB6?

Question

I am going through some old VB code and I run into function definitions like these -

 Private Function ExistingCustomer(Index As Integer, Customer As String)         


        

Answer 1

What is the difference between Sub and Function in VB6?

"sub" can perform some action. "sub" returns no value.

Example:

Form_Load()

"function" can also perform some action but it also returns some value to point from which it was called. that is, "Functions return a value, often based on a variable"

Example:

Val(), FormatPercentage().