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USE OF LOOP BLOCKS
All the programs or projects developed till now run only once. If you want to run a set of statements
more than once, you will either run the code again or write the script again. In Scratch, we can
save our time and effort by repeating the code without writing the program again or writing the
script again. The automatic running of a set of instructions more than once is called looping. The
blocks for looping are given in the Control category.
The repeat block is used to run a set of instructions for a specified number of
times.
The repeat until block is used to run a set of instructions till a condition is satisfied.
The forever block is used to run a set of instructions continuously until
stopped. The instructions inside this block will be executed in a loop until the
Stop button is clicked by the user.
The Repeat and Repeat Until blocks can be used to display the table of a number input by the
user. The script for the sprite can be like this (using the Repeat Until block). Following is the
script for displaying table of a number.
Example of a looped script
The output of the program will be similar to this.
Output
You can also use the forever and repeat blocks with if...then block.
Let us make a small script.
Change the sprite to butterfly and change the backdrop to flowers.
77
Scratch Programming—Game Creation 77

