Starting Out with Python (3rd Edition)
Starting Out with Python (3rd Edition)
3rd Edition
ISBN: 9780133582734
Author: Tony Gaddis
Publisher: PEARSON
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Textbook Question
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Chapter 4, Problem 1MC

A_________-controlled loop uses a true/false condition to control the number of times that it repeats.

a. Boolean

b. condition

c. decision

d. count

Expert Solution & Answer
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Program Description Answer

The “while” loop is a condition-controlled loop; it controls the number of times that the loop repeats.

Hence, the correct answer is option “B”.

Explanation of Solution

Condition controlled loop:

This is a loop that exhibits true or false condition to control the number of times that the loop repeats. For example, the “while” loop is a condition-controlled loop.

  • The “while” loop first checks its expression, and then the statements inside the loop get executed. It is also called as pretest loops.
  • The loop gets terminated when the condition becomes false.

Syntax:

Syntax for the “while” loop is as follows:

  while boolean_expression:

  # while suite

Example Program:

Consider the following example of the condition-controlled loop:

#initialization of variable

a=1

#execute the while loop until a is less than or equal to 5

while a<=5:

         #Print the value of a

         print(a)

         #Increment a by 1 for each iteration of loop

         a+=1

zOutput:

1

2

3

4

5

In the above code, the “while” loop executes until the value of “a” is less than or equal to 5, and then it exits from the program when the condition inside the loop fails.

Explanation for incorrect options:

Boolean:

Boolean is not a loop instead it is a data type that is represented with two values either true or false. This value is based upon the flow of the action performed by the program.

Hence, option “A” is wrong.

Decision:

A decision is not a loop, and it decides the case to be executed based upon the situation.

Hence, option “C” is wrong.

Count controlled loop:

This is a loop that repeats a specific number of times, and it keeps track of the counter variable to track about the number of times that the loop executes. For example, “for” loop is a counter-controlled loop.

Hence, option “D” is wrong.

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Chapter 4 Solutions

Starting Out with Python (3rd Edition)

Ch. 4.3 - What will the following code display? for number...Ch. 4.3 - What will the following code display? for number...Ch. 4.4 - Prob. 13CPCh. 4.4 - Should an accumulator be initialized to any...Ch. 4.4 - What will the following code display? total - 0...Ch. 4.4 - What will the following code display? number 1 =...Ch. 4.4 - Rewrite the following statements using augmented...Ch. 4.5 - Prob. 18CPCh. 4.5 - Why should you take care to choose a distinctive...Ch. 4.6 - What does the phrase garbage in, garbage out mean?Ch. 4.6 - Give a general description of the input validation...Ch. 4.6 - Describe the steps that are generally taken when...Ch. 4.6 - Prob. 23CPCh. 4.6 - If the input that is read by the priming read is...Ch. 4 - A_________-controlled loop uses a true/false...Ch. 4 - A _____-controlled loop repeats a specific number...Ch. 4 - Each repetition of a loop is known as a(n) a cycle...Ch. 4 - The while loop is a _______ type of loop. a....Ch. 4 - A(n) ______ loop has no way of ending and repeats...Ch. 4 - The -= operator is an example of a(n) _________...Ch. 4 - Prob. 7MCCh. 4 - A(n) ____________ is a special value that signals...Ch. 4 - Prob. 9MCCh. 4 - The integrity of a programs output is only as good...Ch. 4 - The input operation that appears just before a...Ch. 4 - Validation loops are also known as _________. a....Ch. 4 - A condition-controlled loop always repeats a...Ch. 4 - The while loop is a pretest loop.Ch. 4 - The following statement subtracts 1 from x: x = x ...Ch. 4 - It is not necessary to initialize accumulator...Ch. 4 - In a nested loop, the inner loop goes through all...Ch. 4 - To calculate the total number of iterations of a...Ch. 4 - The process of input validation works as follows:...Ch. 4 - What is a condition-controlled loop?Ch. 4 - What is a count-controlled loop?Ch. 4 - What is an infinite loop? Write the code for an...Ch. 4 - Why is it critical that accumulator variables are...Ch. 4 - What is the advantage of using a sentinel?Ch. 4 - Prob. 6SACh. 4 - What does the phrase garbage in, garbage out mean?Ch. 4 - Give a general description of the input validation...Ch. 4 - Write a while loop that lets the user enter a...Ch. 4 - Write a while loop that asks the user to enter two...Ch. 4 - Write a for loop that displays the following set...Ch. 4 - Write a loop that asks the user to enter a number....Ch. 4 - Write a loop that calculates the total of the...Ch. 4 - Rewrite the following statements using augmented...Ch. 4 - Write a set of nested loops that display 10 rows...Ch. 4 - Write code that prompts the user to enter a...Ch. 4 - Write code that prompts the user to enter a number...Ch. 4 - Bug Collector The Bug Collector Problem A bug...Ch. 4 - Calories Burned Running on a particular treadmill...Ch. 4 - Budget Analysis Write a program that asks the user...Ch. 4 - Distance Traveled The distance a vehicle travels...Ch. 4 - Average Rainfall Write a program that uses nested...Ch. 4 - Celsius to Fahrenheit Table Write a program that...Ch. 4 - Pennies for Pay Write a program that calculates...Ch. 4 - Sum of Numbers Write a program with a loop that...Ch. 4 - Ocean Levels Assuming the ocean's level is...Ch. 4 - Tuition Increase At one college, the tuition for a...Ch. 4 - Calculating the Factorial of a Number In...Ch. 4 - Population Write a program that predicts the...Ch. 4 - Prob. 13PECh. 4 - Prob. 14PE

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