AP CSP Unit 1 Exam

What is the primary purpose of defining functions in programming?

• To make the code harder to understand.

• To debug errors.

• To organize and reuse code.

• To create loops.

Answer explanation

The primary purpose of defining functions in programming is to organize and reuse code. Functions allow developers to encapsulate logic, making code more modular and easier to maintain, rather than duplicating code throughout the program.

How is a for loop written in Python?

• for i in range(4):

• loop i in range(4):

• repeat i in range(4):

• iterate i in range(4):

Answer explanation

The correct syntax for a for loop in Python is 'for i in range(4):'. This structure allows you to iterate over a sequence of numbers from 0 to 3. The other options use incorrect keywords.

Which of the following ins NOT a common type of loop in programming?

• If Loop

• For Loop

• While Loop

Answer explanation

An If Loop is not a common type of loop in programming. Instead, loops typically include For Loops and While Loops, which are used for repeated execution of code blocks based on conditions or counts.

What is an If statement used for?

• To execute code only if a condition is true

• To repeat code while a condition is true

• To create new variables

• To gather information about Karel's world

Answer explanation

An If statement is used to execute code only when a specified condition is true. This allows for conditional execution, making it a fundamental control structure in programming.

What does the term "debugging" refer to in programming?

• Creating backup copies of code

• Identifying and fixing errors in code

• Adding new features to a program

• Optimizing code for faster execution

Answer explanation

The term 'debugging' specifically refers to the process of identifying and fixing errors in code. This is crucial for ensuring that a program runs correctly and efficiently, making it the correct choice among the options.

What is a run-time error?

• A mistake that occurs during the execution of a program

• A mistake in the syntax of the code

• A mistake in the logic of the code

• A mistake that occurs during code compilation

Answer explanation

A run-time error occurs when a program is running, leading to unexpected behavior or crashes. This distinguishes it from syntax errors, which happen during code writing, and logic errors, which occur when the code runs but produces incorrect results.

What is pseudocode?

• A programming language

• A brief explanation of code in plain English

• A type of algorithm

• A control structure

Answer explanation

Pseudocode is a way to describe algorithms using plain English, making it easier to understand the logic without the syntax of a programming language. Thus, the correct choice is 'A brief explanation of code in plain English'.

A while() loop is used to:

• Execute a section of code until a condition is met

• Wait a specified length of time

• Ensure that the battery has enough power for an operation

• Check an input repeatedly

Answer explanation

A while() loop is designed to execute a block of code repeatedly as long as a specified condition remains true. This makes 'Execute a section of code until a condition is met' the correct choice.

What does this code do?

• Moves forward 1 time

• Moves forward forever

• Moves forward 5 times

• Moves left

Answer explanation

The code likely contains a loop that instructs a movement function to execute 5 times, resulting in moving forward 5 times. This matches the correct answer choice.

What is a postcondition in a function?

• • What happens before the function is called.

• • What is true after the function is called.

• A variable in the function.

• The name of the function.

Answer explanation

The player_health variable is used to store the player's current health points, which is essential for tracking the player's status in the game. This distinguishes it from other variables that might store names or monster health.