Qbasic Tutorial 2.1

Variables and Data Types

Variables

● Hold Data in Memory.● Are assigned to a Data Type.● The data can change at any time during the program's

operation.● The data entered must be the same type as the assigned

Data Type.

Qbasic Data Types

● String - Text and Characters● Integer - Non point number between -32,768 to 32,767● Long - Non point number between - 2,147,483,648 to

2,147,483,647

Qbasic Data Types

● Single – Floating Point from -3.37 x 1038 to 3.37 x 1038

● Double – Floating Point from -1.67 x 10308 to 1.67 x 10308

Note: Qbasic has problems with the double data type.This problem is not there in QB64.I will be using QB64 for this tutorial.

The Signs to be added after variables

● String - $● Integer - %● Long - &● Single - !● Double - #

QB 64 Data types

● _Integer64 - &&

-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807

● _Float - ##

-1.18 x 104932 to 1.18 x 104932

Tutorial 2.1

This tutorial will use:

QB64 running on Windows 7 Ultimate 64 bit

and

Qbasic [running in DOSBox on (W7)] and running normally on WinXP 32 bit.

First, I'll show the data type error....

So, I open this ..... and press F5

And, This is what I get!

So, I got 3.2 and a bunch of other numbers.

Now, To make sure....

But YAY!

Again,

AaaaaaaRgggggHH!

So, I got 3.59999999Insted of 3.6

Now you understand?

Old Method

First, I will teach you the old method of definig variables

Hey I forgot to print the header!

New Method

● This is the new method for variables● Visual BASIC also uses this method.

That is all. Thank you.

Don't forget to download the source codes zip

and

If you like this, please comment and rate accordingly.

Thank you