By this time, you hopefully understand a few things. The first is the for-loop and
the second is the ability to ask the computer true/false questions. Lastly, with the
if-statement you were able to make the computer react to the result of a true/false question.
Like the for-loop, the while-loop can cause the computer to execute a chunk of code over and over again.
But unlike the for-loop, which is primarily used for counting, the while-loop can loop over and over
again without doing any counting at all! In fact, a while-loop will run a chunk of code over and over again,
until a true/false condition you give it becomes false. It is a very useful looping structure.
Let's start with a simple example that mimics the for-loop, and does a bit of counting.
while condition do BODY end
Move the mouse over a dotted box for more information.
Now you try. Put a condition in the while ... do line to have the computer count from 1 to 10.
Type your code here:
See your results here:
This code will not run! What condition will you put in the while loop to cause it to count
in the variable a from $1$ to $10$? In other words, you want to keep the while loop
going as long as a is less than or equal to 10.
Share your code
Show a friend, family member, or teacher what you've done!