Unit 3 Karel Programming Review 2

Which of the following is used to create a loop that executes as long as a condition is true?

• for

• do-while

• while

• loop

Why would we use a while loop instead of a for loop?

• we don't know how many times we want to run the loop

• we know how many times we want to run the loop

• It's a structure that is more efficient to code and execute

• it's best practicies

Control structure that lets us do either one section of code or another depending on a test.

• If Statement

• If/Else Statement

• For loop

• While Loop

What type of error occurs when the program runs but produces incorrect results?

• Syntax error

• Runtime error

• Logic error

Answer explanation

A logic error occurs when a program runs without crashing but produces incorrect results due to flaws in the algorithm or logic. This distinguishes it from syntax errors, which prevent the program from running, and runtime errors, which cause crashes.

What is the purpose of using an 'if' statement?

• To define a new function.

• To import external libraries.

• To make decisions based on conditions.

• To repeat a block of code.

Answer explanation

An 'if' statement is used to make decisions based on conditions. It allows the program to execute certain blocks of code only when specific criteria are met, enabling dynamic behavior in the code.

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.

Finding and fixing errors in programs

• Tech support
• Decompose
• Debugging
• Fixing

Which of the following is not a valid condition to go in an if statement for Karel?

• ballsPresent()

• frontIsClear()

• leftIsBlocked()

• turnLeft()

How many total times will Karel move in this program?

• 2

• 3

• 4

• 5

What condition should be used in this while loop to get Karel to move until there is a wall in the way?

• noBallsPresent();

• ballsPresent();

• frontIsClear();

• turnLeft();