Calculate the number of balls needed to fill a ball pit.
Select the button below to open the Python program in a new window. Run the program and read the lines of code to see if you can understand how it works. It will be helpful to arrange your display so that you can have this browser window on one side of the screen and the code on the other.
Watch this video to learn about the new concepts shown in the program:
Questions to think about with this program to check your understanding:
Explain why both `int` and `float` are used in programming. Why don’t we always use float for storing numbers?
Why have comments been added to the end of lines 21 for the units instead of storing ball_pit_radius as “1m” and the ball_pit_height as “0.2m” as you might in Maths or Science?
Comments allow the programmer to remember the units of measurement. The processor can’t perform arithmetic on strings, only integer and float data types. Including the unit with the number would mean it is a string because letters are strings.
Change the program below so that it:
Enter the radius of the ball pit in meters: 2
Enter the height of the ball pit in meters: 0.5
Enter the radius of one ball in meters: 0.05
You need 9000 balls to fill the ball pit.
Use these resources to help you meet the success criteria if you need support or syntax reminders.
Just like in math you can use brackets to change the default order of operations. Known as BIDMAS or BODMAS: Brackets, Indices, Division, Multiplication, Addition, Subtraction.
You can also structure your program into more than one subprogram.
Run the unit tests below to check that your program has met the success criteria.