Problem Solving with C++ (9th Edition)
9th Edition
ISBN: 9780133591743
Author: Walter Savitch
Publisher: PEARSON
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Textbook Question
Chapter 1.2, Problem 12STE
An
Place 2 teaspoons of sugar in mixing bowl.
Add 1 egg to mixing bowl.
Add 1 cup of milk to mixing bowl.
Add 1 ounce of rum, if you are not driving.
Add vanilla extract to taste.
Beat until smooth.
Pour into a pretty glass.
Sprinkle with nutmeg.
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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 1 Solutions
Problem Solving with C++ (9th Edition)
Ch. 1.1 - Prob. 1STECh. 1.1 - What would be the data for a program to add two...Ch. 1.1 - Prob. 3STECh. 1.1 - What is the difference between a machine-language...Ch. 1.1 - What is the role of a compiler?Ch. 1.1 - What is a source program? What is an object...Ch. 1.1 - What is an operating system?Ch. 1.1 - What purpose does the operating system serve?Ch. 1.1 - Prob. 9STECh. 1.1 - Prob. 10STE
Ch. 1.1 - Prob. 11STECh. 1.2 - An algorithm is approximately the same thing as a...Ch. 1.2 - Prob. 13STECh. 1.2 - Prob. 14STECh. 1.2 - Prob. 15STECh. 1.3 - If the following statement were used in a C++...Ch. 1.3 - What is the meaning of \n as used in the following...Ch. 1.3 - What is the meaning of the following statement...Ch. 1.3 - What is the meaning of the following statement...Ch. 1.3 - What is the meaning of this directive? # include...Ch. 1.3 - What, if anything, is wrong with the following...Ch. 1.4 - Prob. 22STECh. 1.4 - Prob. 23STECh. 1.4 - If you omit a punctuation symbol (such as a...Ch. 1.4 - Omitting the final brace } from a program produces...Ch. 1.4 - Prob. 26STECh. 1.4 - Suppose you write a program that is supposed to...Ch. 1 - Using your text editor, enter (that is, type in)...Ch. 1 - Modify the C++ program you entered in Practice...Ch. 1 - Further modify the C++ program that you already...Ch. 1 - Modify the C++ program that you entered in...Ch. 1 - Modify the C++ program that you entered in...Ch. 1 - Prob. 6PCh. 1 - Write a C++ program that reads in two integers and...Ch. 1 - Write a program that prints out C S ! in large...Ch. 1 - Write a program that allows the user to enter a...Ch. 1 - Write a program that allows the user to enter a...Ch. 1 - Write a program that inputs a character from the...
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