Variables, input and output

A way of labeling data with a descriptive name, so our programs can be understood more clearly by the reader and ourselves.

It is helpful to think of variables as containers that hold information. 

Their sole purpose is to label and store data in memory. This data can then be used throughout your program.

Assume two numbers; 5 and 6 are given. 

If we were to declare two variables to store these values, they would be: 

Number1 ← 5  

Number2 ← 6

Assume radius of a circle is 10 and we are asked to calculate the circumference of this circle.

The variables we would use: 

Radius ← 10
Circumference ← 2 * PI* Radius
PS: See there is no space used in any variables.