Starting Out with Java: Early Objects (6th Edition)
6th Edition
ISBN: 9780134462011
Author: Tony Gaddis
Publisher: PEARSON
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Textbook Question
Chapter 5.10, Problem 5.21CP
Write code that does the following: opens a file named MyName.txt, reads the first line from the file and displays it, and then closes the file.
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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 5 Solutions
Starting Out with Java: Early Objects (6th Edition)
Ch. 5.1 - What will the following program segments display?...Ch. 5.2 - How many times will Hello World be printed in the...Ch. 5.2 - How many times will I love Java programming! be...Ch. 5.3 - Write an input validation loop that asks the user...Ch. 5.3 - Write an input validation loop that asks the user...Ch. 5.3 - Write an input validation loop that asks the user...Ch. 5.5 - Name the three expressions that appear inside the...Ch. 5.5 - You want to write a for loop that displays I love...Ch. 5.5 - What will the following program segments display?...Ch. 5.5 - Write a for loop that displays your name 10 times.
Ch. 5.5 - Write a for loop that displays all of the odd...Ch. 5.5 - Write a for loop that displays every fifth number,...Ch. 5.6 - Write a for loop that repeats seven times, asking...Ch. 5.6 - In the following program segment, which variable...Ch. 5.6 - Prob. 5.15CPCh. 5.10 - What is the difference between an input file and...Ch. 5.10 - What import statement will you need in a program...Ch. 5.10 - What class do you use to write data to a file?Ch. 5.10 - Write code that does the following: opens a file...Ch. 5.10 - What classes do you use to read data from a file?Ch. 5.10 - Write code that does the following: opens a file...Ch. 5.10 - You are opening an existing file for output. How...Ch. 5.10 - What clause must you write in the header of a...Ch. 5 - Prob. 1MCCh. 5 - Prob. 2MCCh. 5 - Prob. 3MCCh. 5 - What is each repetition of a loop known as? a....Ch. 5 - This is a variable that controls the number of...Ch. 5 - The while loop is this type of loop. a. pretest b....Ch. 5 - The do-while loop is this type of loop. a. pretest...Ch. 5 - The for loop is this type of loop. a. pretest b....Ch. 5 - This type of loop has no way of ending and repeats...Ch. 5 - This type of loop always executes at least once....Ch. 5 - This expression is executed by the for loop only...Ch. 5 - Prob. 12MCCh. 5 - This is a special value that signals when there...Ch. 5 - To open a file for writing, you use the following...Ch. 5 - To open a file for reading, you use the following...Ch. 5 - Prob. 16MCCh. 5 - This class allows you to use the print and println...Ch. 5 - This class allows you to read a line from a file....Ch. 5 - True or False: The while loop is a pretest loop.Ch. 5 - True or False: The do-while loop is a pretest...Ch. 5 - True or False: The for loop is a posttest loop.Ch. 5 - True or False: It is not necessary to initialize...Ch. 5 - True or False: One limitation of the for loop is...Ch. 5 - True or False: A variable may be defined in the...Ch. 5 - True or False: In a nested loop, the inner loop...Ch. 5 - True or False: To calculate the total number of...Ch. 5 - // This code contains ERRORS! // It adds two...Ch. 5 - Prob. 2FTECh. 5 - // This code contains ERRORS! int choice, num1,...Ch. 5 - Prob. 4FTECh. 5 - Write a while loop that lets the user enter a...Ch. 5 - Write a do-whi1e loop that asks the user to enter...Ch. 5 - Write a for loop that displays the following set...Ch. 5 - Write a loop that asks the user to enter a number....Ch. 5 - Write a for loop that calculates the total of the...Ch. 5 - Write a nested loop that displays 10 rows of #...Ch. 5 - Write nested loops to draw this pattern:Ch. 5 - Write nested loops to draw this pattern: ## # # #...Ch. 5 - Complete the following program so it displays a...Ch. 5 - Convert the while loop in the following code to a...Ch. 5 - Convert the do-while loop in the following code to...Ch. 5 - Convert the following while loop to a for loop:...Ch. 5 - Convert the following for loop to a while loop:...Ch. 5 - Write an input validation loop that asks the user...Ch. 5 - Write an input validation loop that asks the user...Ch. 5 - Prob. 16AWCh. 5 - Prob. 17AWCh. 5 - Modify the code you wrote in Question 14 so it...Ch. 5 - Write code that opens a file named NumberList.txt...Ch. 5 - Prob. 1SACh. 5 - Why should you indent the statements in the body...Ch. 5 - Describe the difference between pretest loops and...Ch. 5 - Why are the statements in the body of a loop...Ch. 5 - Describe the difference between the while loop and...Ch. 5 - Which loop should you use in situations where you...Ch. 5 - Which loop should you use in situations where you...Ch. 5 - Which loop should you use when you know the number...Ch. 5 - Why is it critical that accumulator variables are...Ch. 5 - What is an infinite loop? Write the code for an...Ch. 5 - Describe a programming problem that would require...Ch. 5 - What does it mean to let the user control a loop?Ch. 5 - What is the advantage of using a sentinel?Ch. 5 - Prob. 14SACh. 5 - Describe a programming problem requiring the use...Ch. 5 - How does a file buffer increase a programs...Ch. 5 - Why should a program close a file when its...Ch. 5 - What is a files read position? Where is the read...Ch. 5 - When writing data to a file, what is the...Ch. 5 - What does the Scanner classs hasNext method return...Ch. 5 - What is a potential error that can occur when a...Ch. 5 - Prob. 22SACh. 5 - How do you open a file so that new data will be...Ch. 5 - Sum of Numbers Write a program that asks the user...Ch. 5 - Distance Traveled The distance a vehicle travels...Ch. 5 - Distance File Modify the program you wrote for...Ch. 5 - Pennies for Pay Write a program that calculates...Ch. 5 - Hotel Occupancy A hotels occupancy rate is...Ch. 5 - Population Write a program that will predict the...Ch. 5 - Average Rainfall Write a program that uses nested...Ch. 5 - The Greatest and Least of These Write a program...Ch. 5 - Payroll Report Design a Payroll class that stores...Ch. 5 - SavingsAccount Class Design a SavingsAccount class...Ch. 5 - Deposit and Withdrawal Files Use Notepad or...Ch. 5 - Bar Chart Write a program that asks the user to...Ch. 5 - Celsius to Fahrenheit Table Write a program that...Ch. 5 - FileDisplay Class Write a class named FileDisplay...Ch. 5 - UpperCaseFile Class Write a class named...Ch. 5 - Budget Analysis Write a program that asks the user...Ch. 5 - Random Number Guessing Game Write a program that...Ch. 5 - Random Number Guessing Game Enhancement Enhance...Ch. 5 - Square Display Write a program that asks the user...Ch. 5 - Coin-Toss Simulator Write a class named Coin. The...Ch. 5 - Tossing Coins for a Dollar For this assignment,...Ch. 5 - Dice Game Write a program that uses the Die class...Ch. 5 - Fishing Game Simulation Write a program that uses...Ch. 5 - A Game of 21 Write a program that uses the Die...Ch. 5 - ESP Game Write a program that tests your ESP...Ch. 5 - Prob. 26PCCh. 5 - Personal Web Page Generator Write a program that...
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