Suppose you are developing a program that calculates interest on a loan. You can create a function that accepts the loan amount and the payback period. The function can then use the loan amount and payback period to calculate the interest and return the value. Why use functions The advantages of using functions are the same as the ones in the above section on why use subroutines. Rules of naming functions The rules for naming functions as the same as the ones in the above section on rules for naming subroutines.
VBA Syntax for declaring Function
Private Function myFunction (ByVal arg1 As Integer, ByVal arg2 As Integer) myFunction = arg1 + arg2 End Function
HERE in the syntax, Function demonstrated with Example: Functions are very similar to the subroutine. The major difference between a subroutine and a function is that the function returns a value when it is called. While a subroutine does not return a value, when it is called. Let’s say you want to add two numbers. You can create a function that accepts two numbers and returns the sum of the numbers.
Create the user interface Add the function Write code for the command button Test the code
Step 1) User interface Add a command button to the worksheet as shown below
Set the following properties of CommanButton1 to the following.
Step 2) Function code.
Press Alt + F11 to open the code window Add the following code
Private Function addNumbers(ByVal firstNumber As Integer, ByVal secondNumber As Integer) addNumbers = firstNumber + secondNumber End Function
HERE in the code, Step 3) Write Code that calls the function
Right click on btnAddNumbers_Click command button Select View Code Add the following code
Private Sub btnAddNumbersFunction_Click() MsgBox addNumbers(2, 3) End Sub
HERE in the code, Step 4) Run the program, you will get the following results
Download Excel containing above code Download the above Excel Code
Summary:
A function is a piece of code that performs a specific task. A function returns a value after execution. Both subroutines and functions offer code reusability Both subroutines and functions help break down large chunks of code into small manageable code.
