Function Procedures return values. you can use Function statement to write your own Function procedures.
Like a Sub procedure, a Function procedure is a separate procedure that can take arguments, perform a series of statements, and change the value of its arguments.
Syntax:
[Private|Public][Static]Function procedurename (arguments) [As type]
statements
End Function
Note that:
1.You call a function by including the function procedure name and arguments on the right side of a larger statement or expression (returnvalue = function()).
2.Function procedures have data types, just as variables. This determines the type of the return value.
3.You return a value by assigning it to the procedurename itself.
Example:
Public function Addition(a,b)
Addition=a+b
End Function
Here Function addition is declared .It takes two arguments and then add these two values. It returns sum of two values.