The main purpose of the functions is to accept certain inputs and pass them on to the main program to finish the execution and also are similar to normal procedures but. They are two types of function, the functions created by the programmers and the built-in functions(or internal functions).

The general format of a function is

where arguments are values that are passed on to functions.

In this lesson, we are going to learn two very basic but useful internal functions, i.e. InputBox ( ) function and sthe MsgBox( ).

The objective of MsgBox is to prompt the user to click on a command button before he /she can continues and produce a pop-up message box. This message box format is as follows:

The first argument in the above format, Prompt, will display the message in the message box and the Style Value will determine what type of command buttons appear on the message box, please refer to table which is given below for types of command button displayed. The Title argument will display title of the message board.

There are four types of icons available in VB as shown in the following table:

An InputBox( ) function will display a message box where the user can enter a message in the form of text or a value. The format is as follows:
 

myMessage=InputBox(Prompt, Title, default_text, x-position, y-position)

myMessage is a variant data type but typically it is declared as string and this accept the message input by the users. The arguments are explained as follows: follows:
 

• Prompt                                 - The message displayed normally as the question asked.
• Title                                      - The title of Input Box.
• default-text                            - The default text that appears in the input field where users may change to the message he wish to key in and he can use it as his intended input.
• x-position and y-position      - the coordinate or the position of the input box.