Activity- Create a Variable
In this lesson, Arun and Raj will be discussing how to create your own variable and control it.
Arun- Let’s start. To create a new variable, click on the make a variable tab in the variable menu.
Raj- A make a variable dialogue box appears.
Arun- Write the name of your variable.
Raj- I will write as score.
Arun- Click on OK. You will see your variable appears at the variable menu.
Raj- What these blocks do?
Arun- To show your variable on the screen, tick the check box in front of 
block. Or you can use another block to show your score.
Raj- Which block?
Arun- 
block, this will show the score without ticking the check-box.
Raj- How?
Arun- Drag out this block in the starfish scripting area, select your variable from the drop-down list.
Raj- On clicking, the starfish’s score appears in the screen.
Arun- Similarly again to hide this use 
block, select your variable from drop-down list. Click on it.
Raj- Starfish’s score removed again.
Arun- Correct! Now move further to 
block.
Raj- What is the use of this block?
Arun- let’s see by dragging out this block in scripting area of starfish, select your variable from drop-down list. Click on it.
Raj- The value is set to the particular value given.
Arun- To gradually increase the score use 
block, select your variable from drop-down list. Click on it.
Raj- Every time I click, the score increased by given value.
Arun- To understand more properly, Let’s create a game.
Raj- which game?
Arun- Drag out these blocks and snap it together. Copy the code in both the sprites.
Raj- The score is at 0.
Arun- Yes now click on the green flag.
Raj- Whenever the sprites are touching each other, the value of is score increasing.
Arun- These are the Variable blocks; every variable you create will has these four controlling blocks.
There are also some lists blocks which we will be discussing next.