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Iteration

Chloe Evans

Chloe Evans

3 min read

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Study Guide Overview

This guide covers iteration and loops in AP Computer Science Principles. It focuses on two main loop types: Repeat n Times loops (using REPEAT n TIMES in pseudocode and for...in range in Python) and Repeat Until Condition loops. The guide also explains loop components like the loop variable and how to determine the number of loop repetitions.

Iteration: Loops in AP Computer Science Principles

Hey there, future AP Computer Science Principles rockstar! Let's dive into the world of loops, also known as iterative statements. These are your trusty tools for repeating actions in your code. Think of them as the 'repeat' button on your favorite song, but way more powerful. Let's get started!

Types of Loops

There are two main types of loops you'll encounter:

Key Concept

Repeat n Times Loops

These loops execute a block of code a specific number of times. It's like saying, "Do this action exactly 5 times."

  • Pseudocode: REPEAT n TIMES

    n = 5
REPEAT n TIMES:
  print (n)

  • Python Equivalent: for... in range loop

python for x in range (0, 6): print (x) # This loop runs 5 times (0, 1, 2, 3, 4, 5)

Or, equivalently:

for x in range (6): print (x)

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Question 1 of 5

What are the two main types of loops discussed in the notes? 🤔

While loops and For loops

REPEAT n TIMES loops and Conditional loops

REPEAT n TIMES loops and for...in range loops

Infinite loops and Finite loops