C How to Program (8th Edition)
8th Edition
ISBN: 9780133976892
Author: Paul J. Deitel, Harvey Deitel
Publisher: PEARSON
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Chapter 2, Problem 2.26E
(Multiples) Write a
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6. (Summing Integers) Write a program that uses a for statement to sum a sequence of integers. Assume that the first integer read specifies the number of values remaining to be entered. Your program should read only one value per input statement. A typical input sequence might be 5 100 200 300 400 500 where the 5 indicates that the subsequent 5 values are to be summed.
(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
5.
(Algebra: solve 2 X 2 linear equations) You can use Cramer's rule to solve the
following 2 X 2 system of linear equation:
ax + by = e
cx + dy = f
●
x =
ed - bf
bc
ad
y =
af - ec
ad
bc
-
Write a program that prompts the user to enter a, b, c, d, e, and f and display the
result. If ad- bc is 0, report that The equation has no solution.
Enter a, b, c, d, e, f: 9.0, 4.0, 3.0, -5.0, -6.0, -21.0 Enter
x is -2.0 and y is 3.0
Enter a, b, c, d, e, f: 1.0, 2.0, 2.0, 4.0, 4.0, 5.0 Enter
The equation has no solution
Chapter 2 Solutions
C How to Program (8th Edition)
Ch. 2 - Identify and correct the errors in each of the...Ch. 2 - Fill in the blanks in each of the following: _____...Ch. 2 - Write a single C statement or line that...Ch. 2 - State which of the following are true and which...Ch. 2 - Prob. 2.11ECh. 2 - What, if anything, prints when each of the...Ch. 2 - Which, if any, of the following C statements...Ch. 2 - Given the equation y=ax3+7, which of the...Ch. 2 - State the order of evaluation of the operators in...Ch. 2 - (Arithmetic) Write a program that asks the user to...
Ch. 2 - (Printing Values with print!) Write a program that...Ch. 2 - (Comparing Integers) Write a program that asks the...Ch. 2 - (Arithmetic, Largest Value and Smallest Value)...Ch. 2 - (Diameter, Circumference and Area of a Circle)...Ch. 2 - Prob. 2.21ECh. 2 - What does the following code print? printf( *\n) ;Ch. 2 - (Largest and Smallest Integers) Write a program...Ch. 2 - (Odd or Even) Write a program that reads an...Ch. 2 - Print your initials in block letters down the...Ch. 2 - (Multiples) Write a program that reads in two...Ch. 2 - (Checkerboard Pattern of Asterisks) Display the...Ch. 2 - Prob. 2.28ECh. 2 - (Integer Value of a Character) Heres a peek ahead....Ch. 2 - (Separating Digits in an Integer) Write a program...Ch. 2 - (Table of Squares and Cubes) Using only the...Ch. 2 - (Body Mass Index Calculator) We introduced the...Ch. 2 - Prob. 2.33MD
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