Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
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Textbook Question
Chapter 1.7, Problem 23SC
Consider the following pseudocode for finding the most attractive photo from a sequence of photos:
Set "the best so far" to the first photo.
For each photo in the sequence
If the photo is more attractive than "the best so far"
Set "the best so far" to the photo.
Report "the best so far" as the most attractive photo in the sequence.
Is this an
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Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command:
Osh> !!
The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command.
Whentheuserentersasingle!followedbyanintegerN,theNthcommandin the history is executed. In the example above, if the user entered the command:
Osh> ! 3
The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command.
Error handling:
The program should also manage basic error handling. For example, if there are no commands in the history, entering !! should result in a message “No commands in history.” Also, if there is no command corresponding to the number entered with the single !, the program should output "No such command in history."
Activity No.
Activity
Time (weeks)
Immediate Predecessors
1
Requirements collection
3
2
Requirements structuring
4
1
3
Process analysis
3
2
4
Data analysis
3
2
5
Logical design
50
3,4
6
Physical design
5
5
7
Implementation
6
6
c. Using the information from part b, prepare a network diagram. Identify the critical path.
2. UNIX Shell and History Feature [20 points]
This question consists of designing a C program to serve as a shell interface that
accepts user commands and then executes each command in a separate process. A
shell interface gives the user a prompt, after which the next command is entered.
The example below illustrates the prompt osh> and the user's next command:
cat prog.c. The UNIX/Linux cat command displays the contents of the file
prog.c on the terminal using the UNIX/Linux cat command and your program
needs to do the same.
osh> cat prog.c
The above can be achieved by running your shell interface as a parent process.
Every time a command is entered, you create a child process by using fork(),
which then executes the user's command using one of the system calls in the
exec() family (as described in Chapter 3). A C program that provides the general
operations of a command-line shell can be seen below.
#include
#include
#define MAX LINE 80 /* The maximum length command */
{
int…
Chapter 1 Solutions
Big Java Late Objects
Ch. 1.1 - What is required to play music on a computer?Ch. 1.1 - Why is a CD player less flexible than a computer?Ch. 1.1 - What does a computer user need to know about...Ch. 1.2 - Prob. 4SCCh. 1.2 - Which part of the computer carries out arithmetic...Ch. 1.2 - A modern smartphone is a computer, comparable to a...Ch. 1.3 - What are the two most important benefits of the...Ch. 1.3 - Prob. 8SCCh. 1.4 - Prob. 9SCCh. 1.4 - Prob. 10SC
Ch. 1.5 - How do you modify the HelloPrinter program to...Ch. 1.5 - How would you modify the HelloPrinter program to...Ch. 1.5 - Would the program continue to work if you replaced...Ch. 1.5 - What does the following set of statements print?...Ch. 1.5 - What do the following statements print?...Ch. 1.6 - Suppose you omit the "" characters around Hello,...Ch. 1.6 - Suppose you change println to Printline in the...Ch. 1.6 - Suppose you change main to hello in the...Ch. 1.6 - Prob. 19SCCh. 1.6 - Prob. 20SCCh. 1.7 - Prob. 21SCCh. 1.7 - Suppose your cell phone carrier charges you 29.95...Ch. 1.7 - Consider the following pseudocode for finding the...Ch. 1.7 - Suppose each photo in Self Check 23 had a price...Ch. 1.7 - Prob. 25SCCh. 1.7 - Prob. 26SCCh. 1 - Explain the difference between using a computer...Ch. 1 - Prob. 2RECh. 1 - Prob. 3RECh. 1 - Prob. 4RECh. 1 - Prob. 5RECh. 1 - Prob. 6RECh. 1 - What does this program print? public class Test {...Ch. 1 - What does this program print? Pay close attention...Ch. 1 - Prob. 9RECh. 1 - Write three versions of the HelloPrinter.java...Ch. 1 - How do you discover syntax errors? How do you...Ch. 1 - The cafeteria offers a discount card for sale that...Ch. 1 - Write an algorithm to settle the following...Ch. 1 - Consider the question in Exercise R1.13. Suppose...Ch. 1 - In order to estimate the cost of painting a house,...Ch. 1 - In How To 1.1, you made assumptions about the...Ch. 1 - Suppose you put your younger brother in charge of...Ch. 1 - Write pseudocode for an algorithm that describes...Ch. 1 - The ancient Babylonians had an algorithm for...Ch. 1 - Write a program that prints a greeting of your...Ch. 1 - Write a program that prints the sum of the first...Ch. 1 - Write a program that prints the product of the...Ch. 1 - Write a program that prints the balance of an...Ch. 1 - Write a program that displays your name inside a...Ch. 1 - Write a program that prints your name in large...Ch. 1 - Write a program that prints your name in Morse...Ch. 1 - Write a program that prints a face similar to (but...Ch. 1 - Write a program that prints an imitation of a Piet...Ch. 1 - Write a program that prints a house that looks...Ch. 1 - Write a program that prints an animal speaking a...Ch. 1 - Write a program that prints three items, such as...Ch. 1 - Write a program that prints a poem of your choice....Ch. 1 - Write a program that prints the United States...Ch. 1 - Type in and run the following program. Then modify...Ch. 1 - Type in and run the following program. Then modify...Ch. 1 - Modify the program from Exercise E1.16 so that the...Ch. 1 - Prob. 18PECh. 1 - Write a program that prints a two-column list of...Ch. 1 - In the United States there is no federal sales...Ch. 1 - To speak more than one language is a valuable...Ch. 1 - You want to decide whether you should drive your...Ch. 1 - You want to find out which fraction of your cars...Ch. 1 - The value of can be computed according to the...Ch. 1 - Imagine that you and a number of friends go to a...Ch. 1 - Write an algorithm to create a tile pattern...Ch. 1 - Write an algorithm that allows a robot to mow a...Ch. 1 - Consider a robot that is placed in a room. The...Ch. 1 - Consider a robot that has been placed in a maze....Ch. 1 - Suppose you received a loyalty promotion that lets...Ch. 1 - A television manufacturer advertises that a...Ch. 1 - Cameras today can correct red eye problems caused...
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