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

function in vb

• a function must return some value/s
• Syntax : private function fun_name(argument/s(optional)) as return_type(integer,string..) return value end function
• fun_name(arguments(optional) ) is enough for function call

sub in vb

• a sub need not to be return any value/s

• Syntax : private sub sub_name(argument/s(optional))

  end sub

• sub_name(arguments(optional) ) is enough for function call