Advanced Placement (AP) Computer Science

What defines the term iteration in programming?

1. Executing the code only once.

2. Using a looping control structure.

3. Choosing between different algorithms.

4. Writing code in a sequential manner.

The correct answer is: Using a looping control structure.

Iteration in programming is defined as the process of executing a set of instructions repeatedly, typically utilizing a looping control structure. This allows a program to perform tasks multiple times without needing to write the same code repeatedly. Common examples of looping control structures include `for` loops, `while` loops, and `do while` loops. These structures facilitate executing the same block of code as long as a specified condition remains true. Using iteration is particularly useful for tasks that require repetition, such as processing items in a list or performing calculations a set number of times. The essence of iteration lies in its capacity to handle repetitive tasks efficiently, thus simplifying code maintenance and enhancing performance. Other options do not accurately reflect the concept of iteration. Executing code only once refers to one-time execution without repetition. Choosing between different algorithms pertains to decision-making in program design rather than repeated execution. Writing code in a sequential manner implies a linear flow of control, which does not capture the repetitive nature intrinsic to iteration.