C How to Program (8th Edition)
8th Edition
ISBN: 9780133976892
Author: Paul J. Deitel, Harvey Deitel
Publisher: PEARSON
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Chapter 4, Problem 4.33E
(Roman-Numeral Equivalent of Decimal Values)Write a
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(Phone key pads) The international standard letter/number mapping found on the
telephone is shown below:
100
2 abc
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4 ghi
5 ikl
6mno
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8 tuv
9wxyz
Write a program that prompts the user to enter a letter and displays its correspond-
ing number.
(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
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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
(Same-number subsequence) JAVA
Class Name: Exercise22_05
Write an O(n) program that prompts the user to enter a sequence of integers ending with 0 and finds the longest subsequence with the same number.
Sample Run 1
Enter a series of numbers ending with 0:2 4 4 8 8 8 8 2 4 4 0The longest same number sequence starts at index 3 with 4 values of 8
Sample Run 2
Enter a series of numbers ending with 0: 34 4 5 4 3 5 5 3 2 0
The longest same number sequence starts at index 5 with 2 values of 5
Chapter 4 Solutions
C How to Program (8th Edition)
Ch. 4 - Find the error in each of the following. (Note:...Ch. 4 - State which values of the control variable x are...Ch. 4 - Write for statements that print the following...Ch. 4 - Prob. 4.8ECh. 4 - (Sum a Sequence of Integers) Write a program that...Ch. 4 - (Average a Sequence of Integers) Write a program...Ch. 4 - (Find the Smallest) Write a program that finds the...Ch. 4 - (Calculating the Sum of Even Integers) Write a...Ch. 4 - (Calculating the Product of Odd Integers) Write a...Ch. 4 - (Factorials) The factorial function is used...
Ch. 4 - (Modified Compound-Interest Program) Modify the...Ch. 4 - (Triangle-Printing Program) Write a program that...Ch. 4 - (Calculating Credit Limits) Collecting money...Ch. 4 - (Bar-Chart Printing Program) One interesting...Ch. 4 - (Calculating Sales)An online retailer sells five...Ch. 4 - (Truth Tables) Complete the following truth tables...Ch. 4 - Rewrite the program of Fig. 4.2 so that the...Ch. 4 - Prob. 4.22ECh. 4 - (Calculating the Compound Interest with...Ch. 4 - Assume i=1,j=2,k=3andm=2. What does each of the...Ch. 4 - (Table of Decimal, Binary, Octal and Hexadecimal...Ch. 4 - (Calculating the Value of )Calculate the value of...Ch. 4 - Prob. 4.27ECh. 4 - (Calculating Weekly Pay)A company pays its...Ch. 4 - (De Morgans Laws)In this chapter, we discussed the...Ch. 4 - (Replacing switch with if ... else)Rewrite the...Ch. 4 - (Diamond-Printing Program)Write a program that...Ch. 4 - (Modified Diamond-Printing Program)Modify the...Ch. 4 - (Roman-Numeral Equivalent of Decimal Values)Write...Ch. 4 - Describe the process you would use to replace a do...Ch. 4 - A criticism of the break statement and the...Ch. 4 - Prob. 4.36ECh. 4 - Describe in general how you would remove any...Ch. 4 - (The Twelve Days of Christmas Song) Write a...Ch. 4 - (Limitations of Floating-Point Numbers for...Ch. 4 - (World Population Growth) World population has...Ch. 4 - (Tax Plan Alternatives; The FairTax) There are...
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