Starting Out with Java: Early Objects, Student Value Edition (6th Edition)
6th Edition
ISBN: 9780134457918
Author: GADDIS, Tony
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 7MC
This is the name of a reference variable that is always available to an instance method and refers to the object that is calling the method.
- a. callingObject
- b. this
- c. me
- d. instance
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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
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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 6 Solutions
Starting Out with Java: Early Objects, Student Value Edition (6th Edition)
Ch. 6.1 - Prob. 6.1CPCh. 6.1 - Prob. 6.2CPCh. 6.1 - Describe the limitation of static methods.Ch. 6.3 - Prob. 6.4CPCh. 6.3 - What is a methods signature?Ch. 6.3 - Prob. 6.6CPCh. 6.3 - How many default constructors may a class have?Ch. 6.4 - Prob. 6.8CPCh. 6.4 - Prob. 6.9CPCh. 6.4 - Prob. 6.10CP
Ch. 6.5 - Recall the Rectangle class shown earlier in this...Ch. 6.9 - Consider the following statement: A car has an...Ch. 6.9 - Why is it not safe to return a reference to an...Ch. 6.9 - A class has a reference variable as an instance...Ch. 6.10 - Prob. 6.15CPCh. 6.12 - Look at the following statement, which declares an...Ch. 6.12 - Assume that the following enumerated data type has...Ch. 6.12 - Prob. 6.18CPCh. 6 - This type of method cannot access any non-static...Ch. 6 - Prob. 2MCCh. 6 - Prob. 3MCCh. 6 - Prob. 4MCCh. 6 - If you write this method for a class, Java will...Ch. 6 - Making an instance of one class a field in another...Ch. 6 - This is the name of a reference variable that is...Ch. 6 - This enum method returns the position of an enum...Ch. 6 - Assuming the following declaration exists: enum...Ch. 6 - You cannot use the fully qualified name of an enum...Ch. 6 - The Java Virtual Machine periodically performs...Ch. 6 - If a class has this method, it is called...Ch. 6 - CRC stands for a. Class, Return value, Composition...Ch. 6 - Prob. 11MCCh. 6 - True or False: A static member method may refer to...Ch. 6 - True or False: All static member variables are...Ch. 6 - Prob. 18TFCh. 6 - Prob. 19TFCh. 6 - Prob. 21TFCh. 6 - True or False: Enumerated data types are actually...Ch. 6 - True or False: enum constants have a toString...Ch. 6 - True or False: A class may not have more than one...Ch. 6 - True or False: A private class that is defined...Ch. 6 - public class MyClass { private int x; private...Ch. 6 - public class TwoValues { private int x, y; public...Ch. 6 - public class MyMath { public static int square(int...Ch. 6 - Assume the following declaration exists : enum...Ch. 6 - l. Consider the following class declaration:...Ch. 6 - A pet store sells dogs, cats, birds, and hamsters....Ch. 6 - Prob. 1SACh. 6 - Prob. 2SACh. 6 - Consider the following class declaration: public...Ch. 6 - Prob. 4SACh. 6 - How does method overloading improve the usefulness...Ch. 6 - Prob. 6SACh. 6 - Even if you do not write an equals method for a...Ch. 6 - A has a relationship can exist between classes....Ch. 6 - Prob. 9SACh. 6 - Is it advisable or not advisable to write a method...Ch. 6 - Prob. 11SACh. 6 - Look at the following declaration: enum Color {...Ch. 6 - Assuming the following enum declaration exists:...Ch. 6 - Under what circumstances does an object become a...Ch. 6 - Area Class Write a class that has three overloaded...Ch. 6 - InventoryItem Class Copy Constructor Add a copy...Ch. 6 - Carpet Calculator The Westfield Carpet Company has...Ch. 6 - LandTract Class Make a LandTract class that has...Ch. 6 - Month Class Write a class named Month. The class...Ch. 6 - Employee Class Modification In Programming...Ch. 6 - RetailItem Class Modification Modify this chapters...Ch. 6 - Sales Receipt File Modify the program you wrote in...Ch. 6 - Parking Ticket Simulator For this assignment you...Ch. 6 - Geometry Calculator Design a Geometry class with...Ch. 6 - Car Instrument Simulator For this assignment, you...Ch. 6 - First to One Game This game is meant for two or...Ch. 6 - Heads or TaiLs Game This game is meant for two or...
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