C++ How to Program (10th Edition)
10th Edition
ISBN: 9780134448237
Author: Paul J. Deitel, Harvey Deitel
Publisher: PEARSON
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Chapter 4, Problem 4.27E
(Palindromes) A palindrome is a number or a text phrase that reads the same backward as forward. For example, each of the following five-digit integers is a palindrome: 12321, 55555, 45554and 11611. Write a
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(Financial: credit card number validation) Credit card numbers follow certain pat-
terns. A credit card number must have between 13 and 16 digits. It must start with:
4 for Visa cards
5 for Master cards
37 for American Express cards
6 for Discover cards
In 1954, Hans Luhn of IBM proposed an algorithm for validating credit card
numbers. The algorithm is useful to determine whether a card number is entered
correctly or whether a credit card is scanned correctly by a scanner. Credit card
numbers are generated following this validity check, commonly known as the
Luhn check or the Mod 10 check, which can be described as follows (for illustra-
tion, consider the card number 4388576018402626):
1. Double every second digit from right to left. If doubling of a digit results in a
two-digit number, add up the two digits to get a single-digit number.
4388576018402626
→ 2 * 2 = 4
→ 2 * 2 = 4
→ 4 * 2 = 8
→ 1 * 2 = 2
6 * 2 = 12 (1+ 2 = 3)
→ 5 * 2 = 10 (1+ 0 = 1)
→ 8 * 2 = 16 (1 + 6 = 7)
→ 4 * 2 = 8
(Bar-Chart Printing Program) One interesting application of computers is drawing graphsand bar charts. Write a program that reads five numbers (each between 1 and 30). For each numberread, your program should print a line containing that number of adjacent asterisks. For example,if your program reads the number seven, it should print *******.
Chapter 4 Solutions
C++ How to Program (10th Edition)
Ch. 4 - (Correct the Code Errors) Identity and correct the...Ch. 4 - (What Does this Program Do?) What does the...Ch. 4 - For Exercises 4.13—4.16, perform each of these...Ch. 4 - For Exercises 4.13—4.16, perform each of these...Ch. 4 - For Exercises 4.13—4.16, perform each of these...Ch. 4 - For Exercises 4.13—4.16, perform each of these...Ch. 4 - (Find the largest) The process of finding the...Ch. 4 - (Tabular Output) Write a C++ program that uses a...Ch. 4 - (Find the Two Largest Numbers) Using an approach...Ch. 4 - (Validating User Input) The examination-results...
Ch. 4 - (What Does this Program Do?) What does the...Ch. 4 - (What Does this Program Do?) What does the...Ch. 4 - (Dangling-else Problem)C++ compliers always...Ch. 4 - (Another Dangling-else Problem) Based on the...Ch. 4 - (Another Dangling-else Problem) Based on the...Ch. 4 - (Square of Asterisks) Write a program that reads...Ch. 4 - (Palindromes) A palindrome is a number or a text...Ch. 4 - (Printing the Decimal Equivalent of a Binary...Ch. 4 - (Checkerboard Pattern of Asterisks) W rite a...Ch. 4 - (Multiples of 2 with an Infinite Loop) write a...Ch. 4 - (Calculating a Circle’s Diameter, circumference...Ch. 4 - What’s wrong with the following statement? Provide...Ch. 4 - (Sides of a Triangle) Write a program that reads...Ch. 4 - (Sides of a Right Triangle) Write a program that...Ch. 4 - (Factorial) The factorial of a nonnegative integer...Ch. 4 - (Modified Account Class) Modify class Account...Ch. 4 - (Enforcing Privacy with Cryptography) The...Ch. 4 - (World Population Growth) World population has...
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