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?

<p>Dog Turtle (D)</p> Signup and view all the answers

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

<p>WOW !!! (A)</p> Signup and view all the answers

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

<p>To swap the values of x and y (A)</p> Signup and view all the answers

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

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

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

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

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

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

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

<p>Either true or false (C)</p> Signup and view all the answers

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

<p>Return whether the word is in the list (C)</p> Signup and view all the answers

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

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

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

<p>3 (B)</p> Signup and view all the answers

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

<p>x*5 (C)</p> Signup and view all the answers

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

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

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

<p>2<em>3</em>x (C)</p> Signup and view all the answers

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

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

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

<p>5 (B)</p> Signup and view all the answers

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

<p>y*x (A)</p> Signup and view all the answers

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

<p>They are ignored (A)</p> Signup and view all the answers

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

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

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

<p>They are appended to resultList (D)</p> Signup and view all the answers

What is the purpose of the Input_List_From_User function?

<p>To ask the user for several values and return them as a list (D)</p> 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]?

<p>[1, 3, 5] (C)</p> 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.

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