C How to Program (8th Edition)
8th Edition
ISBN: 9780133976892
Author: Paul J. Deitel, Harvey Deitel
Publisher: PEARSON
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Chapter 9, Problem 9.9E
(Rounding Floating-Point Numbers) 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
(Average a Sequence of Integers) Write a program that calculates and prints the average ofseveral integers. Assume the last value read with scanf is the sentinel 9999. A typical input sequencemight be10 8 11 7 9 9999indicating that the average of all the values preceding 9999 is to be calculated
(Display a pattern) Write a program that displays the following pattern:JJ aaa v vaaaJ J aa v v a aJ aaaa v aaaa
Chapter 9 Solutions
C How to Program (8th Edition)
Ch. 9 - Write a printf or scanf statement for each of the...Ch. 9 - (Differences Between %d and %i) Write a program to...Ch. 9 - (Printing Numbers in Various Field Widths) Write a...Ch. 9 - (Rounding Floating-Point Numbers) Write a program...Ch. 9 - (Temperature Conversions) Write a program that...Ch. 9 - (Escape Sequences) Write a program to test the...Ch. 9 - (Printing a Question Mark) Write a program that...Ch. 9 - (Reading an Integer with Each scanf Conversion...Ch. 9 - (Outputting a Number with the Floating-Point...Ch. 9 - (Reading Strings in Quotes) In some programming...
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