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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Students have asked these similar questions
(Calculating the Sum of Even Integers) Write a program that calculates and prints the sumof the even integers from 2 to 30.
(Sort three integers) Write a program that prompts the user to enter three integers and display the integers in non-decreasing order.
(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 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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- (Sort three integers) Write a program that prompts the user to enter three integers and displays them increasing order.arrow_forward(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 calculatedarrow_forward(Display a pattern) Write a program that displays the following pattern:JJ aaa v vaaaJ J aa v v a aJ aaaa v aaaaarrow_forward
- (Sum the digits in an integer) Write a program that reads an integer between 0 and 1000 and adds all the digits in the integer. For example, if an integer is 932, the sum of all its digits is 14.arrow_forward(Phone key pads) The international standard letter/number mapping found on the telephone is shown below: 100 2 abc 3 def 4 ghi 5 ikl 6mno 7pgrs 8 tuv 9wxyz Write a program that prompts the user to enter a letter and displays its correspond- ing number.arrow_forward(Count positive and negative numbers and compute the average of numbers) Write a program that reads an unspecified number of integers, determines how many positive and negative values have been read, and computes the total and average of the input values (not counting zeros). Your program ends with the input 0. Display the maximum, minimum, and average as a floating-point number. Here is a sample run:Enter an integer, the input ends if it is 0: 1 2 -1 3 0The number of positives is 3The number of negatives is 1The maximum is 3.0The minimum is -1.0The average is 1.25arrow_forward
- Find the error(s) in the following code: (6)arrow_forward(Numerical) Using the srand() and rand() C++ library functions, fill an array of 1000 floating-point numbers with random numbers that have been scaled to the range 1 to 100. Then determine and display the number of random numbers having values between 1 and 50 and the number having values greater than 50. What do you expect the output counts to be?arrow_forward(Financials: currency exchange) Write a program that prompts the user to enter the exchange rate from currency in U.S. dollars to Rupees PKR. Prompt the user to enter 0 to convert from U.S. dollars to Rupees PKR and 1 to convert from Rupees PKR and U.S. dollars. Prompt the user to enter the amount in U.S. dollars or Rupees PKR to convert it to Rupees PKR or U.S. dollars, respectively. Use c++ program.arrow_forward
- (Sort three integers) Write a program that prompts the user to enter THREE integers and display the integers in decreasing order. Prepare your problem analysis and algorithm (pseudocode or flowchart) to plan your solution.arrow_forward(Sum a Sequence of Integers) Write a program that sums a sequence of integers. Assume thatthe first integer read with scanf specifies the number of values remaining to be entered. Your program should read only one value each time scanf is executed. A typical input sequence might be5 100 200 300 400 500where the 5 indicates that the subsequent five values are to be summed.arrow_forward4. (Looping statement) java Given an integer, display its reversed order. Sample Output: Enter n : 876 The reversed order of 876 is 678.arrow_forward
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