C How to Program (8th Edition)
8th Edition
ISBN: 9780133976892
Author: Paul J. Deitel, Harvey Deitel
Publisher: PEARSON
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Chapter 3, Problem 3.38E
(Counting 7s) Write a
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6.
(Geometry: area of a pentagon) The area of a pentagon can be computed using the
following formula (s is the length of a side):
Area
5x s²
4 X tan
TT
5
Write a program that prompts the user to enter the side of a pentagon and displays
the area. Here is a sample run:
Enter the side: 5.5 Enter
The area of the pentagon is 53.04444136781625
Q1: (Palindrome number) Write a program that prompts the user to enter a three-digit integer and determines whether it is a palindrome number. A number is palindrome if it reads the same from right to left and from left to right.
Here is a sample run of this program:
Enter a three-digit integer: 121
121 is a palindrome
Enter a three-digit integer: 123
123 not a palindrome
(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
Chapter 3 Solutions
C How to Program (8th Edition)
Ch. 3 - Indentify and correct the errors in each of the...Ch. 3 - Fill in the blanks in each of the following: The...Ch. 3 - Prob. 3.12ECh. 3 - Write a single pseudocode statement that indicates...Ch. 3 - Formulate a pseudocode algorithm for each of the...Ch. 3 - State which of the following are true and which...Ch. 3 - For Exercises 3.16-3.20, perform each of these...Ch. 3 - For Exercises 3.16 -3.20, perform each of these...Ch. 3 - (Sales-Commission Calculator) One large chemical...Ch. 3 - (Interest Calculator) The simple interest on a...
Ch. 3 - (Salary Calculator) Develop a program that will...Ch. 3 - (Predecrementing vs. Postdecrementing)Write a...Ch. 3 - (Printing Numbers from a Loop) Write a program...Ch. 3 - (Find the Largest Number) The process of finding...Ch. 3 - (Tabular Output) Write a program that uses looping...Ch. 3 - (Tabular Output) Write a program that utilizes...Ch. 3 - (Find the Two Largest Numbers) Using an approach...Ch. 3 - (Validating User Input) Modify the program in...Ch. 3 - Prob. 3.28ECh. 3 - Prob. 3.29ECh. 3 - (Dangling-Else Problem) Determine the output for...Ch. 3 - (Another Dangling-Else Problem) Modify the...Ch. 3 - Prob. 3.32ECh. 3 - (Hollow Square of Asterisks) Modify the program...Ch. 3 - (Palindrome Tester) A palindrome is a number or a...Ch. 3 - (Printing the Decimal Equivalent of a Binary...Ch. 3 - (How Fast Is Your Computer?) How can you determine...Ch. 3 - (Detecting Multiples of 10) Write a program that...Ch. 3 - (Counting 7s) Write a program that reads an...Ch. 3 - (Checkerboard Pattern of Asterisks) Write a...Ch. 3 - (Multiples of 2 with an Infinite Loop) Write a...Ch. 3 - (Diameter, Circumference and Area of a Cirle)...Ch. 3 - Whats wrong with the following statement? Rewrite...Ch. 3 - (Sides of a Triangle) Write a program that reads...Ch. 3 - (Sides of a Right Triangle) Write a program that...Ch. 3 - (Factorial) The factorial of a nonnegative integer...Ch. 3 - (World-Population-Growth Calculator) Use the web...Ch. 3 - (Target-Heart-Rate Calculator) While exercising,...Ch. 3 - (Enforcing Privacy with Cryptography) The...
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