Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
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Chapter 4, Problem 19PE
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The area of a hexagon can be computed using thefollowing formula (s is the length of a side):
Write a program that prompts the user to enter the side of a hexagon and displaysits area. Here is a sample run:
Enter the side: 5.5 ↵EnterThe area of the hexagon is 78.59
Write a program that reads from the user a character ('q' or 'c').
If the character is 'c', the program reads from the user the radius rof a circle and prints its area.
• If the user enters 'q', the program asks the user to enter the length and width of a quadrilateral. We
assume the quadrilateral is either a square or rectangle. You should print if the quadrilateral is square
or rectangle.
• Otherwise, it prints "Wrong character"
PS: Use the following formulas:
area of circle=3.14*r
Sample Run1:
Enter a character (q or c): q
Enter the Length and Width: 80 150
|It is a rectangle
Sample Run2:
Enter a character (q or c): q
Enter the Length and Width: 80 80
It is a square
Sample Run3:
Enter a character (q or c): c
Enter the radius: 2
The area of the circle is 12.56
Sample Run4:
Enter a character (q or c): d
Wrong character
java Write a program that prompts the user to enter a point (x, y) and checks whether the point is within the rectangle centered at (0, 0) with width 10 and height 5. For example, (2, 2) is inside the rectangle and (6, 4) is outside the rectangle, as shown in the Figure.
(Hint: A point is in the rectangle if its horizontal distance to (0, 0) is less than or equal to 10 / 2 and its vertical distance to (0, 0) is less than or equal to 5 / 2.)
Here are sample runs of the program:
Sample 1:
Enter a point with two coordinates: 2 2
Point (2.0, 2.0) is in the rectangle
Sample 2:
Enter a point with two coordinates: 6 4
Point (6.0, 4.0) is not in the rectangle
Analysis:
(Describe the problem including input and output in your own words.)
Design:
(Describe the major steps for solving the problem.)
Coding: (Go over your code step by step)
Testing: (Describe how you test this program). In other words run your code with sample outputs.
Chapter 4 Solutions
Big Java Late Objects
Ch. 4.1 - How many years does it take for the investment to...Ch. 4.1 - If the interest rate is 10 percent per year, how...Ch. 4.1 - Modify the program so that the balance after each...Ch. 4.1 - Suppose we change the program so that the...Ch. 4.1 - What does the following loop print? int n = 1;...Ch. 4.2 - Hand-trace the following code, showing the value...Ch. 4.2 - Hand-trace the following code, showing the value...Ch. 4.2 - Hand-trace the following code, assuming that a is...Ch. 4.2 - Trace the following code. What error do you...Ch. 4.2 - Prob. 10SC
Ch. 4.3 - Write the for loop of the InvestmentTable.java...Ch. 4.3 - How many numbers does this loop print? for (int n...Ch. 4.3 - Write a for loop that prints all even numbers...Ch. 4.3 - Write a for loop that computes the sum of the...Ch. 4.3 - How would you modify the for loop of the...Ch. 4.4 - Prob. 16SCCh. 4.4 - Rewrite the input check do loop using a while loop...Ch. 4.4 - Suppose Java didnt have a do loop. Could you...Ch. 4.4 - Write a do loop that reads integers and computes...Ch. 4.4 - Write a do loop that reads integers and computes...Ch. 4.5 - What does the SentinelDemo.java program print when...Ch. 4.5 - Why does the SentinelDemo.java program have to...Ch. 4.5 - What would happen if the declaration of the salary...Ch. 4.5 - In the last example of this section, we prompt the...Ch. 4.5 - Prob. 25SCCh. 4.6 - Prob. 26SCCh. 4.6 - Google has a simple interface for converting...Ch. 4.6 - Consider a modification of the program in Self...Ch. 4.6 - Prob. 29SCCh. 4.6 - Produce a storyboard for a program that compares...Ch. 4.7 - What total is computed when no user input is...Ch. 4.7 - Prob. 32SCCh. 4.7 - What are the values of position and ch when no...Ch. 4.7 - Prob. 34SCCh. 4.7 - Prob. 35SCCh. 4.7 - Prob. 36SCCh. 4.8 - Why is there a statement System.out.println(); in...Ch. 4.8 - How would you change the program to display all...Ch. 4.8 - Prob. 39SCCh. 4.8 - What do the following nested loops display? for...Ch. 4.8 - Prob. 41SCCh. 4.9 - Prob. 42SCCh. 4.9 - You need to write a program for DNA analysis that...Ch. 4.9 - Prob. 44SCCh. 4.9 - Consider the task of finding numbers in a string....Ch. 4.10 - How do you simulate a coin toss with the...Ch. 4.10 - How do you simulate the picking of a random...Ch. 4.10 - Why does the loop body in Dice.java call...Ch. 4.10 - Prob. 49SCCh. 4.10 - Prob. 50SCCh. 4 - Given the variables String stars = ""; String...Ch. 4 - What do these loops print? a. int i = 0; int j =...Ch. 4 - What do these code snippets print? a. int result =...Ch. 4 - Write awhile loop that prints a. All squares less...Ch. 4 - Write a loop that computes a. The sum of all even...Ch. 4 - Provide trace tables for these loops. a. int i =...Ch. 4 - What do these loops print? a. for (int i = 1; i ...Ch. 4 - What is an infinite loop? On your computer, how...Ch. 4 - Write a program trace for the pseudocode in...Ch. 4 - What is an off-by-one error? Give an example from...Ch. 4 - What is a sentinel value? Give a simple rule when...Ch. 4 - Which loop statements does Java support? Give...Ch. 4 - How many iterations do the following loops carry...Ch. 4 - Write pseudocode for a program that prints a...Ch. 4 - Prob. 15RECh. 4 - Write pseudocode for a program that reads a...Ch. 4 - Write pseudocode for a program that reads a...Ch. 4 - Rewrite the following for loop into a while loop....Ch. 4 - Rewrite the following do loop into a while loop....Ch. 4 - Provide trace tables of the following loops. a....Ch. 4 - What do the following loops print? Work out the...Ch. 4 - What do the following program segments print? Find...Ch. 4 - Prob. 23RECh. 4 - Add a storyboard panel for the conversion program...Ch. 4 - In Section 4.6, we decided to show users a list of...Ch. 4 - Change the storyboards in Section 4.6 to support a...Ch. 4 - Draw a flowchart for a program that carries out...Ch. 4 - In Section 4.7.5, the code for finding the largest...Ch. 4 - What are nested loops? Give an example where a...Ch. 4 - The nested loops for (int 1 = 1; 1 = height; i++)...Ch. 4 - Suppose you design an educational game to teach...Ch. 4 - In a travel simulation, Harry will visit one of...Ch. 4 - Write programs with loops that compute a. The sum...Ch. 4 - Write programs that read a sequence of integer...Ch. 4 - Write programs that read a line of input as a...Ch. 4 - Complete the program in How To 4.1 on page 171....Ch. 4 - Write a program that reads a set of floating-point...Ch. 4 - Translate the following pseudocode for finding the...Ch. 4 - Translate the following pseudocode for randomly...Ch. 4 - Write a program that reads a word and prints each...Ch. 4 - Write a program that reads a word and prints the...Ch. 4 - Write a program that reads a word and prints the...Ch. 4 - Write a program that reads a word and prints the...Ch. 4 - Write a program that reads a word and prints all...Ch. 4 - Write a program that reads a string and prints the...Ch. 4 - Write a program that reads a sequence of words and...Ch. 4 - Write a program that prints all powers of 2 from...Ch. 4 - Write a program that reads a number and prints all...Ch. 4 - Prob. 18PECh. 4 - Write a program that reads an integer and...Ch. 4 - Write a program that reads an integer and...Ch. 4 - Write a program to plot the following face.Ch. 4 - Write a graphical application that displays a...Ch. 4 - Enhance Worked Example 4.1 to check that the...Ch. 4 - Mean and standard deviation. Write a program that...Ch. 4 - The Fibonacci numbers are defined by the sequence...Ch. 4 - Factoring of integers. Write a program that asks...Ch. 4 - Prime numbers. Write a program that prompts the...Ch. 4 - The game of Nim. This is a well-known game with a...Ch. 4 - The Drunkards Walk. A drunkard in a grid of...Ch. 4 - The Monty Hall Paradox. Marilyn vos Savant...Ch. 4 - A simple random generator is obtained by the...Ch. 4 - The Buffon Needle Experiment. The following...Ch. 4 - In the 17th century, the discipline of probability...Ch. 4 - Write a program that reads an initial investment...Ch. 4 - Currency conversion. Write a program that first...Ch. 4 - Write a program that first asks the user to type...Ch. 4 - Your company has shares of stock it would like to...Ch. 4 - Write an application to pre-sell a limited number...Ch. 4 - You need to control the number of people who can...Ch. 4 - Credit Card Number Check. The last digit of a...Ch. 4 - In a predator-prey simulation, you compute the...Ch. 4 - Projectile flight. Suppose a cannonball is...Ch. 4 - Radioactive decay of radioactive materials can be...Ch. 4 - The photo at left shows an electric device called...Ch. 4 - Write a graphical application that draws a spiral,...Ch. 4 - Prob. 28PPCh. 4 - Draw a picture of the four-leaved rose whose...
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