Visual Basic lesson 4

In this lesson we'll talk about understanding variables and datatypes, data type conversion and statements and expressions.

A variable is something similar to a X on an equation. Variables represent a space in a computer's memory that is assigned to store a value. The name of the variable is the used in code to reference the value that is stored in this memory space. Declaring a variable is the act of allocating space in the computer's memory. there are many variable types.

we'll create a new project called lesson 04 and we'll insert a button, 2 text boxes and a label and we will write some code for them.

In VB variable declaration must start by Dim. we can at the same time initialize the variable by adding = and then the value.

There are numerical, alphanumerical, and inside this types, there are also lots of sub-types.
We can understand a variable as a bucket, and the value is what is inside the bucket.
We can put into a variable what is in another variable, just by referring it to the variable we want to copy. Is like X=Y.

Explicit data type conversion require the programmer to write code to perform the conversion.
Implicit data type conversions are handled by VB.