Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
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Chapter 3, Problem 8PP
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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
Big Java Late Objects
Ch. 3.1 - In some Asian countries, the number 14 is...Ch. 3.1 - Consider the following if statement to compute a...Ch. 3.1 - Prob. 3SCCh. 3.1 - Prob. 4SCCh. 3.1 - The variables fuel Amount and fuel Capacity hold...Ch. 3.2 - Which of the following conditions are true,...Ch. 3.2 - Prob. 7SCCh. 3.2 - What is the error in this statement? if (scoreA =...Ch. 3.2 - Supply a condition in this if statement to test...Ch. 3.2 - Prob. 10SC
Ch. 3.3 - In a game program, the scores of players A and B...Ch. 3.3 - Prob. 12SCCh. 3.3 - Prob. 13SCCh. 3.3 - Beginners sometimes write statements such as the...Ch. 3.3 - Prob. 15SCCh. 3.3 - Suppose we want to have the earthquake program...Ch. 3.4 - Prob. 17SCCh. 3.4 - Would that amount change if the first nested if...Ch. 3.4 - Prob. 19SCCh. 3.4 - Prob. 20SCCh. 3.4 - Prob. 21SCCh. 3.5 - Draw a flowchart for a program that reads a value...Ch. 3.5 - Prob. 23SCCh. 3.5 - Prob. 24SCCh. 3.5 - Draw a flowchart for a program that reads a value...Ch. 3.5 - Draw a flowchart for a program that reads a value...Ch. 3.6 - Prob. 27SCCh. 3.6 - Prob. 28SCCh. 3.6 - Prob. 29SCCh. 3.6 - Suppose you are designing a part of a program for...Ch. 3.7 - Suppose x and y are two integers. How do you test...Ch. 3.7 - How do you test whether at least one of them is...Ch. 3.7 - How do you test whether exactly one of them is...Ch. 3.7 - Prob. 34SCCh. 3.7 - What is the advantage of using the type boolean...Ch. 3.8 - In the ElevatorSimulation2 program, what is the...Ch. 3.8 - Your task is to rewrite lines 1926 of the...Ch. 3.8 - In the Sherlock Holmes story The Adventure of the...Ch. 3.8 - Prob. 39SCCh. 3 - What is the value of each variable after the if...Ch. 3 - Prob. 2RECh. 3 - Find the errors in the following if statements. a....Ch. 3 - What do these code fragments print? a. int n = 1;...Ch. 3 - Suppose x and y are variables of type double....Ch. 3 - Suppose x and y are variables of type double....Ch. 3 - Explain why it is more difficult to compare...Ch. 3 - Given two pixels on a computer screen with integer...Ch. 3 - It is easy to confuse the - and operators. Write...Ch. 3 - Each square on a chess board can be described by a...Ch. 3 - Prob. 11RECh. 3 - In a scheduling program, we want to check whether...Ch. 3 - Draw a flowchart for the algorithm in Exercise...Ch. 3 - Draw a flowchart for the algorithm in Exercise...Ch. 3 - Draw a flowchart for the algorithm in Exercise...Ch. 3 - Prob. 16RECh. 3 - Prob. 17RECh. 3 - Write pseudocode for a program that prompts the...Ch. 3 - Write pseudocode for a program that assigns letter...Ch. 3 - Explain how the lexicographic ordering of strings...Ch. 3 - Of the following pairs of strings, which comes...Ch. 3 - Explain the difference between an if/else if/else...Ch. 3 - Give an example of an if/else if/else sequence...Ch. 3 - Rewrite the condition in Section 3.3 to use ...Ch. 3 - Prob. 25RECh. 3 - Make up a Java code example that shows the...Ch. 3 - Complete the following truth table by finding the...Ch. 3 - True or false? A B is the same as B A for any...Ch. 3 - The advanced search feature of many search engines...Ch. 3 - Suppose the value of b is false and the value of x...Ch. 3 - Simplify the following expressions. Here, b is a...Ch. 3 - Simplify the following statements. Here, b is a...Ch. 3 - What is wrong with the following program?...Ch. 3 - Write a program that reads an integer and prints...Ch. 3 - Write a program that reads a floating-point number...Ch. 3 - Write a program that reads an integer and prints...Ch. 3 - Write a program that reads three numbers and...Ch. 3 - Write a program that reads three numbers and...Ch. 3 - Repeat Exercise E3.5, but before reading the...Ch. 3 - Write a program that reads in three integers and...Ch. 3 - Write a program that reads four integers and...Ch. 3 - A compass needle points a given number of degrees...Ch. 3 - Write a program that reads a temperature value and...Ch. 3 - The boiling point of water drops by about one...Ch. 3 - Add error handling to Exercise E3.11. If the user...Ch. 3 - When two points in time are compared, each given...Ch. 3 - The following algorithm yields the season (Spring,...Ch. 3 - Write a program that reads in two floating-point...Ch. 3 - Unit conversion. Write a unit conversion program...Ch. 3 - Write a program that prompts the user to provide a...Ch. 3 - Write a program that asks the user to enter a...Ch. 3 - Write a program that translates a letter grade...Ch. 3 - Write a program that translates a number between 0...Ch. 3 - Write a program that takes user input describing a...Ch. 3 - Write a program that reads in three floating-point...Ch. 3 - Write a program that reads in three strings and...Ch. 3 - Write a program that prompts for the day and month...Ch. 3 - The original U.S. income tax of 1913 was quite...Ch. 3 - Write a program that computes taxes for the...Ch. 3 - The TaxReturn.java program uses a simplified...Ch. 3 - Write a program that reads in the x- and...Ch. 3 - Write a program that reads in the x- and...Ch. 3 - Write a program that reads in the x- and...Ch. 3 - Roman numbers. Write a program that converts a...Ch. 3 - A year with 366 days is called a leap year. Leap...Ch. 3 - French country names are feminine when they end...Ch. 3 - Write a program to simulate a bank transaction....Ch. 3 - Write a program that reads in the name and salary...Ch. 3 - When you use an automated teller machine (ATM)...Ch. 3 - Calculating the tip when you go to a restaurant is...Ch. 3 - A supermarket awards coupons depending on how much...Ch. 3 - Write a program that prompts the user for a...Ch. 3 - Repeat Exercise P3.21, modifying the program so...Ch. 3 - Repeat Exercise P3.21, modifying the program so...Ch. 3 - A minivan has two sliding doors. Each door can be...Ch. 3 - Sound level L in units of decibel (dB) is...Ch. 3 - The electric circuit shown below is designed to...Ch. 3 - Crop damage due to frost is one of the many risks...Ch. 3 - A mass m = 2 kilograms is attached to the end of a...Ch. 3 - The average person can jump off the ground with a...
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