Absolute Java (6th Edition)
6th Edition
ISBN: 9780134041674
Author: Walter Savitch, Kenrick Mock
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 45STE
What numbers could be generated by randomGenerator. nextDouble
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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 3 Solutions
Absolute Java (6th Edition)
Ch. 3 - Write an if-else statement that outputs the word...Ch. 3 - Suppose savings and expenses are variables of type...Ch. 3 - Suppose number is a variable of type int. Write an...Ch. 3 - Suppose salary and deductions are variables of...Ch. 3 - What output will be produced by the following...Ch. 3 - What would be the output in Self-Test Exercise 5...Ch. 3 - What would be the output in Self-Test Exercise 5...Ch. 3 - Write a multiway if-else statement that classifies...Ch. 3 - Prob. 9STECh. 3 - Prob. 10STE
Ch. 3 - Prob. 11STECh. 3 - Prob. 12STECh. 3 - Prob. 13STECh. 3 - Suppose are two variables that have been given...Ch. 3 - Prob. 15STECh. 3 - Assume that nextword is a String variable that has...Ch. 3 - Write an if-else statement that outputs the word...Ch. 3 - Write an if-else statement that outputs the word...Ch. 3 - Determine the value, true or false, of each of the...Ch. 3 - Does the following sequence produce a division by...Ch. 3 - Prob. 21STECh. 3 - Prob. 22STECh. 3 - What output would be produced in Self-Test...Ch. 3 - What is the output produced by the following?
Ch. 3 - What output would be produced in Self-Test...Ch. 3 - Prob. 26STECh. 3 - What is the most important difference between a...Ch. 3 - Prob. 28STECh. 3 - Prob. 29STECh. 3 - What is the output of the following?
Ch. 3 - Rewrite the following for statement as a while...Ch. 3 - What is the output of the following loop? Identify...Ch. 3 - What is the output of the following loop? Comment...Ch. 3 - Prob. 34STECh. 3 - For each of the following situations, tell which...Ch. 3 - What is the output of the following?
Ch. 3 - What is the output of the following?
Ch. 3 - What is the output produced by the following?...Ch. 3 - What is the output produced by the following?...Ch. 3 - Fix the bug in the code in the earlier subsection...Ch. 3 - Add some suitable output statements to the...Ch. 3 - What is the bug in the following code? What do you...Ch. 3 - Prob. 43STECh. 3 - What numbers could be generated by...Ch. 3 - What numbers could be generated by...Ch. 3 - Use the method Math. random to generate a random...Ch. 3 - (This is a version of Programming Project 2.1 from...Ch. 3 - A designer is trying to create a new pattern of...Ch. 3 - Weight is defined as the gravitational force...Ch. 3 - It is difficult to make a budget that spans...Ch. 3 - You have just purchased a stereo system that cost ...Ch. 3 - The Fibonacci numbers Fn are defined as follows:...Ch. 3 - An Armstrong number is an n-digit number that...Ch. 3 - In a certain code language, numerals are each...Ch. 3 - Write a program that calculates the total grade...Ch. 3 - The game of Pig is a simple two-player dice game...Ch. 3 - You have three identical prizes to give away and a...Ch. 3 - Redo or do for the first time Programming Project...Ch. 3 - The file words. txt on the hook's website contains...Ch. 3 - The file words. txt on the book's website contains...Ch. 3 - This problem is based on a "Nifty Assignment" by...Ch. 3 - Prob. 16PP
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