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</p> Signup and view all the answers

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

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

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

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

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

    <p>3</p> Signup and view all the answers

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

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

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

    <p>5</p> Signup and view all the answers

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

    <p>y*x</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</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</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</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</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]</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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    Related Documents

    1.2.1 What Does this Algorithm Do KEY.pdf

    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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