Global variables are divisive ... and why you should be extra careful using them. A computer program is, essentially, a list ...

The computer can store more than one variable ... what is stored in the box at any time. For example, a variable can be used in the program that controls an automatic car park barrier.

In a way it resembles a treasure hunt where the computer must follow the clues and execute commands until it reaches the end of the program and is stopped. Variables are used in most languages, where ...

But by integrating computer programming we can further students’ logical and critical thinking skills by developing their ability to identify variable components abstractly, pay attention to the ...