Python Basics: While Loops and Variables
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Questions and Answers

Which variable name correction was crucial to fix the syntax errors in the given code?

  • Changing 'value' to 'val' in the elif statement
  • Changing 'VAL' to 'value' in the for loop
  • Changing 'value' to 'VAL' in the print statement
  • Changing 'val' to 'VAL' in the if statement (correct)

    • What error was fixed in the following corrected code?

    for VAL in range (0,value):
    if VAL %4 == 0:
        print (VAL *4)
    elif VAL %5 == 0:
        print (VAL+3)
    else:
        print (VAL+10)

  • Indentation error
  • Logical error
  • Syntax error (correct)
  • Type error

    • Which of the following statements is true about the corrected code?

  • It prints multiples of 4 and 5 for values divisible by both.
  • It prints multiples of 5 for values divisible by 5.
  • It prints a fixed number for values divisible by both 4 and 5.
  • It prints multiples of 4 for values divisible by 4. (correct)

    • In the fixed code, what happens when the value of VAL is 10?

    <p>It prints 13</p> Signup and view all the answers

    Which logical construct is primarily used in the example code provided?

    <p>conditional statements</p> Signup and view all the answers

    What is the main purpose of the provided program?

    <p>To check if a string is a palindrome.</p> Signup and view all the answers

    Which of the following is a logical error in the provided program?

    <p>The output message for a palindrome is outside the loop.</p> Signup and view all the answers

    What will be the output for the input string radar?

    <p>It is palindrome.</p> Signup and view all the answers

    What is the purpose of the line mid = length // 2?

    <p>To determine the stopping point for the loop.</p> Signup and view all the answers

    Which variable name should be corrected for proper functioning of the program?

    <p>str to string</p> Signup and view all the answers

    What will be the output of the following code?

    x = 'abcdef'
i = 'a'
while i in x:
  print(i, end='')

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

    What will be the output of the following code?

    values = []
for i in range(1, 4):
  values.append(i)
print(values)

    <p>[1, 2, 3]</p> Signup and view all the answers

    Analyze the following code and identify the final values of 'x' and 'y'.

    x = 10
y = 0
while x &gt; y:
  x = x - 1
  y = y + 1

    What will be the final value of 'y'?

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

    Consider the following code snippet and its output:

    x = 10
y = 0
while x &gt; y:
  print(x, y)
  x = x - 1
  y = y + 1

    Which pair of numbers is printed at the last iteration?

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

    How many iterations will the following loop run?

    x = 10
y = 0
while x &gt; y:
  x = x - 1
  y = y + 1

    <p>10</p> Signup and view all the answers

    What is the purpose of looping from 2 to n/2 in the prime number function?

    <p>To find if n is divisible by any number in the given range</p> Signup and view all the answers

    What will be the output if we run the prime number function with n = 15?

    <p>Number is not prime</p> Signup and view all the answers

    Which of the following correctly describes the output of the cube function for i = 20?

    <p>Cube of number 20 is 8000</p> Signup and view all the answers

    How many times will "Hello" be printed in the provided while loop?

    <p>10 times</p> Signup and view all the answers

    What will be the printed output of the code for i in range(15, 18)?

    <p>Cube of number 15 is 3375 Cube of number 16 is 4096 Cube of number 17 is 4913</p> Signup and view all the answers

    Study Notes

    Python Code Examples

    • Example 1: Printing characters in a string

    • x = "abcdef" and i = "a" are assigned

    • A while loop prints "a" repeatedly until i is no longer in x

    • Output: aaaa

    • Example 2: Appending values to a list

    • An empty list values is created

    • A for loop appends numbers from 1 to 3 to values using range(1, 4)

    • Output: [1, 2, 3]

    Python Revision Tour

    • Code example: Printing x and y values in a while loop
    • x is initially 10, and y is initially 0
    • The loop continues until x is no longer greater than y
    • Output: x and y values decrementing and incrementing, respectively

    Question 1: Correcting syntax errors

    • Original code:
      • VAL and val mismatch in variable naming
      • Corrected code:
        • val is replaced with VAL throughout the code
        • Underlined corrections: VAL%4, VAL%5, and VAL+10

    Question 2: Palindrome checker

    • Original code: incomplete and cropped
    • Corrected code:
      • str is assigned user input using input("enter any string")
      • length is calculated as the length of the input string
      • mid is calculated as half the length of the string
      • A loop checks if the string is a palindrome by comparing characters from the start and end
      • Output: "It is a palindrome" if the string meets the condition, otherwise "it is not a palindrome"

    Prime Number Checker

    • Function prime(n):
      • Takes an integer n as input
      • Loops through numbers from 2 to n/2
      • Checks if n is divisible by any number in the range
      • Prints "Number is not prime" if divisible, otherwise "Number is prime"

    Printing Cubes of Numbers

    • Code example:
      • Loops from 15 to 50 using range(15, 50)
      • Prints the cube of each number in the range

    Printing "Hello" in a Loop

    • Code example:
      • Initializes count to 0
      • A while loop continues until count reaches 10
      • Prints "Hello" and increments count in each iteration
      • Output: "Hello" printed 10 times

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    Description

    Practice writing Python code using while loops and variables to understand the output of given programs.

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