Question

What code structure repeats commands and requires the code to update a variable for comparison to determine when to stop running the code?

A) For loop
B) Switch statement
C) If-else statement
D) While loop

Answer 1

The correct answer is D) While loop, which continuously executes a block of code as long as a specified condition is true, updating a variable that is checked against the condition each iteration.

Step-by-step explanation:

The code structure that repeats commands and requires the code to update a variable for comparison to determine when to stop running the code is a While loop. The While loop will continuously execute a block of statements as long as a specified condition remains true. This involves initializing a variable before the loop starts, then the loop includes commands to execute and usually a statement that updates the variable. The loop checks the variable against its condition at the beginning or end of each iteration, and the loop will terminate when the condition evaluates to false.

On the other hand, a For loop also repeats commands but uses a different syntax that explicitly states the initialization, condition, and update in a single line. A Switch statement is used to select one of many code blocks to execute, while an If-else statement is used for conditional branching, running different code based on whether a condition is true or false.