Question

What type of loop, such as counter-control and sentinel-control, will you use in each of the following situations? a. Sum the following series: 1 + (2 / 1) + (3 / 2) + (4 / 3) + (5 / 4) + ... + (10 / 9) b. Sum the following numbers, except the last number: 17, 32, 62, 48, 58, -1 c. A file contains an employee’s salary. Update the employee’s salary.

Name: Problem 18, Chapter 5: C++ Programming: From Problem Analysis to Program Design
Uploaded: 2020-07-10T22:37:38-08:00
Duration: 2 min 16 s
Channel: Darren Wilson
Description: What type of loop, such as counter-control and sentinel-control, will you use in each of the following situations? a. Sum the following series: 1 + (2 / 1) + (3 / 2) + (4 / 3) + (5 / 4) + ... + (10 / 9) b. Sum the following numbers, except the last number: 17, 32, 62, 48, 58, -1 c. A file contains an employee’s salary. Update the employee’s salary.

   What type of loop, such as counter-control and sentinel-control, will you use in each of the following situations?
a. Sum the following series: 1 + (2 / 1) + (3 / 2) + (4 / 3) + (5 / 4)
+ ... + (10 / 9)
b. Sum the following numbers, except the last number: 17, 32, 62, 48, 58, -1
c. A file contains an employee’s salary. Update the employee’s salary.

C++ Programming: From Problem Analysis to Program Design

D. S. Malik 5th Edition

Chapter 5, Problem 18

Instant Answer

Solved by Expert Darren Wilson

07/10/2020

Step 1

In this situation, we can use a counter-controlled loop because we know the exact number of terms in the series (10 terms). We can use a loop that iterates 10 times, calculating each term and adding it to the sum. Show more…

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What type of loop, such as counter-control and sentinel-control, will you use in each of the following situations? a. Sum the following series: 1 + (2 / 1) + (3 / 2) + (4 / 3) + (5 / 4) + ... + (10 / 9) b. Sum the following numbers, except the last number: 17, 32, 62, 48, 58, -1 c. A file contains an employee’s salary. Update the employee’s salary.

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Key Concepts

Counter-Controlled Loop

A counter-controlled loop uses a control variable that is initialized, tested against a termination condition, and modified with each iteration. It is ideal when the number of iterations needed is known in advance, such as summing a fixed series of numbers.

Sentinel-Controlled Loop

A sentinel-controlled loop continues execution until a special value, known as a sentinel, is encountered. This type of loop is useful when processing data where the number of entries is not predetermined, such as reading input or processing a list that ends with a specific terminator value.

File I/O Loop Control

When dealing with files, loops are often used to process file contents until reaching the end of the file or a designated control value. This approach can combine either counter-controlled or sentinel-controlled methods depending on whether the file length is known or a specific termination point is marked within the file.

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