MYPROGRAMMINGLAB WITH PEARSON ETEXT
8th Edition
ISBN: 9780134225340
Author: Deitel
Publisher: PEARSON
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Textbook Question
Chapter 1, Problem 1.5E
Fill in the blanks in each of the following statements:
- The logical unit that receives information from outside the computer for use by the computer is the _____ .
- The process of instructing the computer to solve a problem is called _____ .
- ______ is a type of computer language that uses Englishlike abbreviations for machine-language instructions.
- ______ is a logical unit that sends information which has already been processed by the computer to various devices so that it may be used outside the computer.
- _____ and _____ are logical units of the computer that retain information.
- _____ is a logical unit of the computer that performs calculations.
- _____ is a logical unit of the computer that makes logical decisions.
- ______ languages are most convenient to the programmer for writing
programs quickly and easily. - The only language a computer can directly understand is that computer’s _____.
- The ______ is a logical unit of the computer that coordinates the activities of all the other logical units.
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Students have asked these similar questions
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…
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