Python Programming: An Introduction to Computer Science
3rd Edition
ISBN: 9781590282779
Author: John Zelle
Publisher: Franklin Beedle & Associates
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Chapter 8, Problem 3MC
Program Description Answer
The loop body executed at least once before executing the loop condition is called as post-test loop.
Hence, the correct option is “D”.
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Looping Construct with Floating Point Numbers
Write a program that utilizes a while-loop to read a set of five floating-point values from user
input. Include code to prevent an endless loop. Ask the user to enter the values, then print the
following data:
Total
Average
Maximum
Minimum
Interest on total at 20%
Answer:
All of the following are looping control structures except
Select one:
while loop
do-while loop
for loop
do loop
none; all of these are looping control structures
Computer Science
1 A while loop is a form of a pre - test loop, meaning that the loop condition is testing prior to executing the loop body. The loop body statements will not executed if the looping condition is not met.
2 The loop condition is a Boolean expression, returns true or false.
3 We continue looping as long as the looping condition is true. 4 The loop condition often has a sentinel value that once is reached the looping
4 The loop condition often has a sentinel value that once is reached the looping will cease.
5 The looping condition is usually associated with a counter that is incremented within the body of the loop.
6 A while() loop does not have a closing ; semi - colon.
7 A while() loop is often used to read an unknown number of records from a text or data file. We read and continue reading as long as we not reached the e.o.f.
(end of file marker)
8 Beware of counter variables that may increment within a loop and erroneously a perceived value of the counter is…
Chapter 8 Solutions
Python Programming: An Introduction to Computer Science
Ch. 8 - Prob. 1TFCh. 8 - Prob. 2TFCh. 8 - Prob. 3TFCh. 8 - Prob. 4TFCh. 8 - Prob. 5TFCh. 8 - Prob. 6TFCh. 8 - Prob. 7TFCh. 8 - Prob. 8TFCh. 8 - Prob. 9TFCh. 8 - Prob. 10TF
Ch. 8 - Prob. 1MCCh. 8 - Prob. 2MCCh. 8 - Prob. 3MCCh. 8 - Prob. 4MCCh. 8 - Prob. 5MCCh. 8 - Prob. 6MCCh. 8 - Prob. 7MCCh. 8 - Prob. 8MCCh. 8 - Prob. 9MCCh. 8 - Prob. 10MCCh. 8 - Prob. 2DCh. 8 - Prob. 3DCh. 8 - Prob. 1PECh. 8 - Prob. 2PECh. 8 - Prob. 3PECh. 8 - Prob. 4PECh. 8 - Prob. 5PECh. 8 - Prob. 6PECh. 8 - Prob. 7PECh. 8 - Prob. 8PECh. 8 - Prob. 9PECh. 8 - Prob. 10PECh. 8 - Prob. 11PECh. 8 - Prob. 12PECh. 8 - Prob. 13PE
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- Problem Description: A while loop and do/while loop will repeat code while the condition is true. The basic difference is when the condition is checked. The while loop checks the condition before the loop starts or after the loop ends. A do/while loop will check the condition at the end of the loop to determine if the loop should be repeated. A do/while loop will run at least once whereas a while may be skipped entirely. while ( ) do I/ Repeated code goes here I/ Repeated code goes here while ( ); Checkpoint 1: Use a while loop to display the numbers 1 through 10. You must initialize your loop counter before the loop and increment the loop counter inside the loop. Checkpoint 2: Use a while to ask the user for a list of numbers. It is not known how many numbers the user will enter, but the last number will be -1. After all numbers have been entered, state how many numbers were put in. Checkpoint 3: Use a do/while loop to display the numbers I through 10. You must initialize your loop…arrow_forwardAll programming languages have a loop capability. Looping is the program logic’s ability to repeat one or more lines of code either: A set number of times, a “for loop” (i.e. 10, 100, 500, 763 or more times) An “unknown” number of times (i.e. loop terminates if a tested condition becomes “true” or as long as the tested condition remains “false”), a “while” loop, a “do until” loop, a “do while” loop. This Lab exercise demonstrates the use of the “For Loop”, a standard loop in all programming languages. C++ standard For Loop format looks like: For (n = 1; n <= 100; n++) { Loop line 1 code; Loop line 2 code; Loop line 3 code; Loop line N code; } The loop code needs: A “loop counter variable” (n in the above example) to keep track of how many iterations this loop has run A starting value (i.e. 1 in the above example) A stop test (i.e. run as…arrow_forwardWhat exactly is the Loop Exit Condition?arrow_forward
- In C++ A for loop is a simplified form of a a. counter-controlled while loop b. sentinel-controlled while loop c. nested for loop d. eof-controlled while looparrow_forwardOverview This program will prompt a user for a start and a limit, it will then while-loop through, doubling the iterator each pass, until the limit is reached. Expected Output Example 1 Enter the start of the loop: Enter the limit of the loop: 25 The current value is 3 The current value is 6 The current value is 12 The current value is 24 The last value of current that was less than 25 was 24 Example 2 Enter the start of the loop: 25 Enter the limit of the loop: 102 The current value is 25 The current value is 50 The current value is 100 The last value of current that was less than 102 was 100 Specifications • You should submit a single file called M5A2.py • It should follow the submission standards outlined here: Submission Standards Your program populate an integer named start using input • Your program populate an integer named limit using input Your program must use an iterator named current Your program must move through the values using a while-loop Tips and Tricks That last…arrow_forwardFor glass-box testing of a for loop, you should test cases where: For glass box tesitng of a for loop, you should test cases where: a) the for loop is not entered b) the body of the for-loop is executed just once c) the body of the for-loop is executed more than once d) all of thesearrow_forward
- write the following for loop as a while looparrow_forwardC++ programming Write a program that reads the grades of 3 students in three different courses and displays the average grade of each student in these three courses, as well as the average grade of all students. You can use any loop method of your preference. (Hint: This is a nested loop technique)arrow_forwardTrue or False It is possible that the body of a while loop might not execute at all.arrow_forward
- in python for glass box testing of a while loop, you should test cases where: a) the while loop is not entered b) the body of the while loop is executed just once c) the body of the while loop is executed more than once e) all of these f) exiting the loop in the middle of the bodyarrow_forwardBriefly explain LOOParrow_forwardThe condition in a posttest loop can be phrased as either a looping condition or a loop exit condition.a. Trueb. Falsearrow_forward
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