Algorithm Analysis: Swapping Variables

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Questions and Answers

What does the code segment do to variable x and variable y?

Swaps the value of x and y (correct)
Sets the value of y to x and the value of x to y
Sets the value of temp to x and then to y
Sets the value of x to y and the value of y to x

What is displayed as a result of running the program with the input 'Karel'?

Hello Karel
What is your name?Hello Karel (correct)
What is your name?Hello
What is your name?HelloKarel

What does the Mystery procedure return if the input number is even?

The result of number divided by 2
True (correct)
Whether or not number is equal to 0
The remainder of number divided by 2

What is displayed as a result of running the program?

Dog Turtle (D) Signup and view all the answers

What is the result of calling the Mystery procedure with an input of 3?

WOW !!! (A) Signup and view all the answers

What is the purpose of the temporary variable in the code segment?

To swap the values of x and y (A) Signup and view all the answers

What is displayed by the program if the user inputs 'John'?

What is your name?Hello John (B) Signup and view all the answers

What is the purpose of the REPEAT TIMES loop in the Mystery procedure?

To display '!' for a specified number of times (B) Signup and view all the answers

What is the purpose of the RANDOM function in the given code segment?

To generate a random number within a specified range (C) Signup and view all the answers

What will be the output of the DISPLAY (x = y) statement?

Either true or false (C) Signup and view all the answers

What is the functionality of the Mystery PROCEDURE in the given code segment?

Return whether the word is in the list (C) Signup and view all the answers

What is the purpose of the REPEAT loop in the given code segment?

To repeat a sequence of actions a fixed number of times (D) Signup and view all the answers

What is the value of Mystery("karel", ["karel", "karel", "tracy", "karel", "karel", "karel", "tracy"])?

3 (B) Signup and view all the answers

What is the equivalent expression to the value returned from Mystery(x)?

x*5 (C) Signup and view all the answers

What is the functionality of the REPEAT loop in the Mystery PROCEDURE?

To repeat a sequence of actions a fixed number of times (B) Signup and view all the answers

What is the equivalent expression to the value returned from Mystery(x) in the second code segment?

23x (C) Signup and view all the answers

What is the purpose of the REPEAT x TIMES loop in the Mystery(x) procedure?

To iterate x times and increment the result variable (A) Signup and view all the answers

What is the value of result after calling Mystery(5)?

5 (B) Signup and view all the answers

What is the equivalent expression to the value returned from Mystery(x, y)?

y*x (A) Signup and view all the answers

What happens to the items in inputList that do not meet the Mystery condition?

They are ignored (A) Signup and view all the answers

What is the purpose of the FOR EACH item in inputList loop?

To iterate over the items in inputList and apply the Mystery condition (D) Signup and view all the answers

What happens to the items in inputList that meet the Mystery condition?

They are appended to resultList (D) Signup and view all the answers

What is the purpose of the Input_List_From_User function?

To ask the user for several values and return them as a list (D) Signup and view all the answers

What is the value of resultList after calling the code segment with Input_List_From_User returning [1, 2, 3, 4, 5]?

[1, 3, 5] (C) Signup and view all the answers

Study Notes

Code Segments and Variable Swapping

The program swaps the value of x and y using a temporary variable temp.
The code segment temp ← x; x ← y; y ← temp is used for swapping.

User Input and Display

The program displays "What is your name?" and waits for user input.
The input is stored in name and then displayed with "Hello".
If the user inputs "Karel", the output will be "What is your name? Hello Karel".

Procedures and Conditional Statements

The Mystery procedure returns whether a number is even using the modulo operator %.
The code segment IF (b = 0) { ... } ELSE { ... } is used for conditional statements.

Program Flow and Display

The program will display "Dog Turtle" as a result of the conditional statements.
The Mystery procedure is called with an input of 3, resulting in "WOW !!!".

Random Number Generation

The program generates random numbers x between 1 and 10, and y between 10 and 20.
The program displays the result of x = y, which can be true or false.

List Operations

The Mystery procedure returns whether or not a word is in a list.
The procedure iterates through the list and returns true if the word is found, and false otherwise.

Counting and Indexing

The Mystery procedure returns the maximum count of consecutive occurrences of a word in a list.
The procedure iterates through the list and updates the maximum count.

Arithmetic Operations

The Mystery procedure returns the result of multiplying a number by 5.
The procedure uses a repeat loop to add the number to a result variable 5 times.

Nested Loops and Counting

The Mystery procedure returns the result of multiplying two numbers.
The procedure uses nested repeat loops to increment a result variable.

Input and Output Procedures

The Mystery procedure returns the input value.
The procedure uses a repeat loop to increment a result variable by 1 for each input.

List Filtering

The Mystery procedure filters a list based on a condition.
The procedure iterates through the list and appends items that meet the condition to a result list.

List Transformation

The Mystery procedure transforms a list by applying a function to each item.
The procedure iterates through the list and appends the result of the function to a result list.

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Description

This quiz analyzes a code segment that swaps the values of two variables, x and y, and asks to identify the effect of the code on these variables.