EBK STARTING OUT WITH VISUAL C#
5th Edition
ISBN: 9780135204818
Author: GADDIS
Publisher: VST
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Textbook Question
Chapter 3, Problem 12MC
You can use a______ to explicitly convert a value from one numeric data type to another, even if the conversion might result in a loss of data.
- a. transpose statement
- b. cast operator
- c. conversion operator
- d. literal conversion
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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
EBK STARTING OUT WITH VISUAL C#
Ch. 3.1 - What control can be used to gather text input from...Ch. 3.1 - Prob. 3.2CPCh. 3.1 - Prob. 3.3CPCh. 3.1 - How do you clear the contents of a TextBox...Ch. 3.2 - What is the purpose of a variable?Ch. 3.2 - Give an example of a variable declaration that...Ch. 3.2 - Prob. 3.7CPCh. 3.2 - Indicate whether each of the following is a legal...Ch. 3.2 - What will be stored in the message variable after...Ch. 3.2 - Prob. 3.10CP
Ch. 3.2 - Assuming the variable greeting has not been...Ch. 3.2 - Will the following statement cause an error? Why...Ch. 3.2 - Write a single declaration statement for the...Ch. 3.3 - Prob. 3.14CPCh. 3.3 - Which of the following variable declarations will...Ch. 3.3 - Write a programming statement that will convert...Ch. 3.3 - Prob. 3.17CPCh. 3.3 - Prob. 3.18CPCh. 3.4 - List the operands for the following math...Ch. 3.4 - Prob. 3.20CPCh. 3.4 - Prob. 3.21CPCh. 3.4 - Prob. 3.22CPCh. 3.4 - Prob. 3.23CPCh. 3.4 - Prob. 3.24CPCh. 3.4 - Rewrite the following statements using combined...Ch. 3.5 - Prob. 3.26CPCh. 3.5 - Prob. 3.27CPCh. 3.5 - Prob. 3.28CPCh. 3.5 - Prob. 3.29CPCh. 3.6 - Prob. 3.30CPCh. 3.6 - Write a programming statement that displays the...Ch. 3.6 - Prob. 3.32CPCh. 3.6 - Prob. 3.33CPCh. 3.6 - Prob. 3.34CPCh. 3.7 - Prob. 3.35CPCh. 3.7 - Prob. 3.37CPCh. 3.7 - Prob. 3.38CPCh. 3.7 - What causes the program to jump to the catch...Ch. 3.7 - Prob. 3.40CPCh. 3.9 - Prob. 3.41CPCh. 3.9 - Write a programming statement that declares a...Ch. 3.9 - Where should you place field declarations in a...Ch. 3.9 - Prob. 3.45CPCh. 3.9 - Prob. 3.46CPCh. 3.10 - Write a programming statement that declares a...Ch. 3.10 - Write a programming statement that uses the...Ch. 3.10 - What method of the Math class can he used to...Ch. 3.12 - What method of the Math class can be used to...Ch. 3.12 - Prob. 3.51CPCh. 3.12 - Prob. 3.52CPCh. 3.12 - Write a programming statement that gives the focus...Ch. 3.12 - Prob. 3.54CPCh. 3.12 - Prob. 3.55CPCh. 3.12 - Prob. 3.56CPCh. 3.12 - Prob. 3.57CPCh. 3.12 - When a GroupBox control is deleted, what happens...Ch. 3.12 - Prob. 3.59CPCh. 3.12 - Prob. 3.60CPCh. 3 - When the user types into a TextBox control, the...Ch. 3 - A_____ is a storage location in memory that is...Ch. 3 - Prob. 3MCCh. 3 - A variables______ indicates the type of data that...Ch. 3 - Fundamental types of data, such as strings,...Ch. 3 - A______ identifies a variable in the program code...Ch. 3 - A common operation performed on strings is_______,...Ch. 3 - A______ belongs to the method in which it is...Ch. 3 - Programmers use the term________ to describe the...Ch. 3 - A variables______ is the time period during which...Ch. 3 - One way to make sure that a variable has been...Ch. 3 - You can use a______ to explicitly convert a value...Ch. 3 - Prob. 13MCCh. 3 - A programmers tools for performing calculations...Ch. 3 - A_______ performs a calculation and gives a value....Ch. 3 - Prob. 16MCCh. 3 - Prob. 17MCCh. 3 - A(n)_______ is a piece of data that is passed into...Ch. 3 - A(n)________ is an unexpected error that occurs...Ch. 3 - Prob. 20MCCh. 3 - Prob. 21MCCh. 3 - Prob. 22MCCh. 3 - A_______ is a name that represents a value that...Ch. 3 - A_______ is a variable that is declared inside a...Ch. 3 - A(n)________ specifics how a class member can be...Ch. 3 - A________ is a field that cannot be changed by any...Ch. 3 - The .NET Framework provides a class named_______,...Ch. 3 - Prob. 28MCCh. 3 - The order in which controls receive the focus is...Ch. 3 - Prob. 30MCCh. 3 - Prob. 1TFCh. 3 - Prob. 2TFCh. 3 - Prob. 3TFCh. 3 - Prob. 4TFCh. 3 - The order of operations dictates that the division...Ch. 3 - Prob. 6TFCh. 3 - When you pass the formatting string "C" or "c" to...Ch. 3 - Prob. 8TFCh. 3 - An error will occur if the compiler finds a...Ch. 3 - Prob. 10TFCh. 3 - Prob. 1SACh. 3 - What two things does a variable declaration...Ch. 3 - Give an example of a programming statement that...Ch. 3 - What is the term used for a number that is written...Ch. 3 - What are the values on the right and left of an...Ch. 3 - Name the family of methods in the .NET Framework...Ch. 3 - Prob. 8SACh. 3 - What is the purpose of a try-catch statement?Ch. 3 - Prob. 10SACh. 3 - Prob. 11SACh. 3 - Prob. 12SACh. 3 - Name Formatter Create an application that lets the...Ch. 3 - Tip, Tax, and Total Create an application that...Ch. 3 - Distance Traveled Assuming there are no accidents...Ch. 3 - Sales Tax and Total Create an application that...Ch. 3 - Celsius and Fahrenheit Temperature Converter...Ch. 3 - Body Mass Index Create an application that lets...Ch. 3 - Prob. 7PPCh. 3 - How Much Insurance? Many financial experts advise...Ch. 3 - Cookie Calories A bag of cookies holds 40 cookies....Ch. 3 - Prob. 10PPCh. 3 - Automobile Costs Create an application that lets...Ch. 3 - Paint Job Estimator A painting company has...Ch. 3 - Property Tax If you own real estate in a...Ch. 3 - Stadium Seating There are three seating categories...
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