Introduction

What is a variable ? A variable is an area into memory to stock data.
Which data ? For example, the color of one car, the best score of one player ... and so on.

Variables in programming are indispensable. We do nothing without variables. So, imagine a program that will ask how old an user is. You wish to print a message if the user is major or minor.

How to do that without variables :-) ? It's symply impossible.

A variable in گامباس owns a datatype. For example, for the age of this user, the value is an interger so, the datatype of this variable will be an interger type. We have in Gambas several datatype, like:

• Integers
• Floats
• Strings
• and so on...

• It must never begin by a digit
• It must never contain any spaces
• It must never contain any accented character

Let's practice

How to use a variable ? Before, we must declare it, i.e "create" it before to use it.

In Visual Basic, it was optional except if you enabled the explicit option.

In گامباس, you must declare all your variables. That's a good way to well develop :-) . That allows you to avoid to make some mistakes.

Here is the way to declare one variable:

You can assign a value like that:

Right now, let's have a look at how to print this variable by using the PRINT statement:

To concatenate any variables to any strings, we use the & operator.

It's easy, isn't it ? :-)

Work with informations from the user

To get some data from user, we will use the INPUT statement. Here is an example about that:

When the program will arrive on this line:

It will stop to wait the data from user until user will press the Return key.