Operators, functions and variable scope

Overview

%, // and ** with worked results, comparisons and logical operators, functions and procedures, parameters, built-in and library subprograms, and local and global variables.

What you need to know

Answer each one before you reveal it.

Questions from this subtopic

Each one with the model answer underneath.

1. 1

   What is printed by print(23 % 4) and then print(23 // 4)?

   Model answer

   The first line prints 3 and the second prints 5. The check is 5 × 4 + 3 = 23.

2. 2

   What is printed by secs = 200, then print(str(secs // 60) + " min " + str(secs % 60) + " s")?

   Model answer

   The code prints 3 min 20 s. The // operator gives the whole minutes and % gives the seconds left over.

3. 3

   State what is printed by print(2 ** 10).

   Model answer

   The code prints 1024. The ** operator raises 2 to the power 10.

4. 4

   What is printed by n = 14, then print(n % 2 == 0)?

   Model answer

   The code prints True. The remainder when 14 is divided by 2 is 0, so the number is even.

5. 5

   What is printed by print(2 + 3 * 4 ** 2)?

   Model answer

   The code prints 50. The power is worked first to give 16, then 3 × 16 = 48, then 2 is added.

6. 6

   What is printed by a = "apple", b = "Apple", then print(a == b)?

   Model answer

   The code prints False. Comparison of strings is case-sensitive, so a lower-case a and a capital A differ.

Other ways to work this

The same content, four other ways.

What is inside Levo

Six ways to work the same material.