WHILE (timer > 0):

Question

PRINT "Carry on playing..."
timer = timer - 1

This code uses:
SelectionIterationSequencing

Answer 1

The code you provided demonstrates iteration. Here's a breakdown of the three basic programming constructs:

1. Sequence: This refers to the execution of statements in a linear, step-by-step manner. Each line of code executes one after the other.

2. Selection: This involves making decisions in the code, typically using conditional statements (like if, else, etc.) to execute certain blocks of code based on conditions.

3. Iteration: This involves repeating a block of code multiple times, usually with a loop structure (like while, for, etc.).

The code snippet you provided uses a while loop to repeatedly print "Carry on playing..." until the timer is no longer greater than 0. Hence, the correct usage in your context is iteration.