Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134670942
Author: Y. Daniel Liang
Publisher: PEARSON
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Chapter 2, Problem 2.15PE
(Geometry: distance of two points) Write a
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(Display Magic Numbers) Display the first N magic numbers, where N is a positive number that the user provides as input. Here, a magic number is a number whose sum of its digits eventually leads to 1. For example, 1234 is a magic number because 1 + 2 + 3 + 4 = 10 and 1 + 0 = 1, while 1235 is not (1 + 2 + 3 + 5 = 11 and 1 + 1 = 2). Write a program that prints out the first N magic numbers, seven on each line.
Here is the sample output:
You are required to use the following function prototype:
bool isMagic(int value); // Returns true if value is a magic number
The outline of this function will be as follows:
Step 1: Calculate the sum of digits of value
Step 2: Repeat Step 1 until we get a single digit
Step 3: If the resulting sum is equal to 1 then it is a magic number, otherwise not
(Display Magic Numbers) Display the first N magic numbers, where N is a positive number that the user provides as input.
Here, a magic number is a number whose sum of its digits eventually leads to 1. For example, 1234 is a magic number
because 1+2+3+4 = 10 and 1 +0 = 1, while 1235 is not (1 +2+ 3 +5 = 11 and 1 +1 = 2). Write a program that prints out
the first N magic numbers, seven on each line.
Here is the sample output:
Enter a positive integer number: 30
1
10
19
28
37
46
55
64
73
82
91
100
109
118
127
136
145
154
163
172
181
190
199
208
217
226
235
244
253
262
You are required to use the following function prototype:
bool isMagic(int value); // Returns true if value is a magic number
The outline of this function will be as follows:
Step 1: Calculate the sum of digits of value
Step 2: Repeat Step 1 until we get a single digit
Step 3: If the resulting sum is equal to 1 then it is a magic number, otherwise not
(Geometry: area of a triangle) Write a program that prompts the user to enter three
points (x1, yl), (x2, y2), (x3, y3) of a triangle and displays its area. The formula
for computing the area of a triangle is
s = (sidel + side2 + side3)/2;
V s(s – sidel)(s – side2)(s – side3)
area =
Chapter 2 Solutions
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Ch. 2.2 - Identify and fix the errors in the following code:...Ch. 2.3 - How do you write a statement to let the user enter...Ch. 2.3 - Prob. 2.3.2CPCh. 2.4 - Prob. 2.4.1CPCh. 2.5 - Identify and fix the errors in the following code:...Ch. 2.6 - Identify and fix the errors in the following code:...Ch. 2.7 - Prob. 2.7.1CPCh. 2.8 - Prob. 2.8.1CPCh. 2.8 - Translate the following algorithm into Java code:...Ch. 2.9 - Prob. 2.9.1CP
Ch. 2.9 - Prob. 2.9.2CPCh. 2.9 - Prob. 2.9.3CPCh. 2.9 - Prob. 2.9.4CPCh. 2.9 - Prob. 2.9.5CPCh. 2.9 - Prob. 2.9.6CPCh. 2.9 - Write a statement to display the result of 23.5.Ch. 2.9 - Suppose m and r are integers. Write a Java...Ch. 2.10 - How many accurate digits are stored in a f1oat or...Ch. 2.10 - Prob. 2.10.2CPCh. 2.10 - Prob. 2.10.3CPCh. 2.10 - Which of the following are correct literals?...Ch. 2.11 - How would you write the following arithmetic...Ch. 2.12 - Prob. 2.12.1CPCh. 2.13 - Prob. 2.13.1CPCh. 2.14 - Which of these statements are true? a. Any...Ch. 2.14 - Show the output of the following code: int a = 6;...Ch. 2.15 - Prob. 2.15.1CPCh. 2.15 - Prob. 2.15.2CPCh. 2.15 - Show the following output: float f =12.5F; int i =...Ch. 2.15 - If you change (int) (tax 100) / 100.0 to (int)...Ch. 2.15 - Prob. 2.15.5CPCh. 2.15 - Write an expression that rounds up a double value...Ch. 2.16 - How would you write the following arithmetic...Ch. 2.17 - Show the output of Listing 2.10 with the input...Ch. 2.18 - Can you declare a variable as int and later...Ch. 2.18 - Prob. 2.18.2CPCh. 2.18 - Will overflow cause a runtime error?Ch. 2.18 - Prob. 2.18.4CPCh. 2 - (Convert Celsius to Fahrenheit) Write a program...Ch. 2 - (Compute the volume of a cylinder) Write a program...Ch. 2 - (Convert feet into meters) Write a program that...Ch. 2 - (Convert pounds into kilograms) Write a program...Ch. 2 - (Financial application: calculate tips) Write a...Ch. 2 - (Sum the digits in an integer) Write a program...Ch. 2 - (Find the number of years) Write a program that...Ch. 2 - (Current time) Listing 2.7. ShowCurrentTime.java,...Ch. 2 - (Physics: acceleration) Average acceleration is...Ch. 2 - (Science: calculating energy) Write a program that...Ch. 2 - (Population projection) Rewrite Programming...Ch. 2 - (Physics: finding runway length) Given an...Ch. 2 - (Financial application: compound value) Suppose...Ch. 2 - (Health application: computing BMI) Body Mass...Ch. 2 - (Geometry: distance of two points) Write a program...Ch. 2 - (Geometry: area of a hexagon) Write a program that...Ch. 2 - (Science: wind-chill temperature) How cold is it...Ch. 2 - (Print a table) Write a program that displays the...Ch. 2 - (Geometry: area of a triangle) Write a program...Ch. 2 - (Financial application: calculate interest) If you...Ch. 2 - (Financial application: calculate future...Ch. 2 - (Financial application: monetary units) Rewrite...Ch. 2 - (Cost of driving) Write a program that prompts the...
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