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Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Chapter 10.3, Problem 10.1PP
Program Plan Intro
Opening and Closing files:
Using “Open” function, a process can open an existing file or generates a new file.
- This function is used to converts a filename to a file descriptor and returns the result as a descriptor number.
- The descriptor returned is always the lowest descriptor that is not presently open in the process.
- Each process in the LINUX begins life with three open files.
- Descriptor 0 – standard input.
- Descriptor 1 – standard output.
- Descriptor 2 – standard error.
- The “open” function consists of three arguments. That is “Open(filename, flags, mode)”.
- The argument “filename” defines the name of the given file.
- The argument “flags” represents how the process plans to access the file. Some flags names are as follows.
- O_RDONLY – it means reading only.
- O_WRONLY – it means writing only.
- O_RDWR – it means reading and writing.
- The “mode” argument identifies the access permission bits of new files.
Example:
The example for open an existing file for reading is shown below:
sample1 = Open("foo1.txt", O_RDONLY, 0);
From the above “open” function,
- The filename is “foo1.txt”.
- Flag name is “O_RDONLY”.
- Mode is “0”.
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Students have asked these similar questions
Problem 2 (5 pts)
Write a Python program that plays the game Ro-Sham-Bo (a.k.a., Rock, Paper, Scissors) for a player
and a computer opponent. The player selects one of the options listed in a console prompt, then the
computer randomly selects an option as well. The winner of the game is determined as follows:
Rock beats Scissors - Scissors beats Paper - Paper beats Rock
The same selection results in a tie.
Your program must do the following:
Prompt the player to enter a selection in the console. Provide instructions to user on what is
a valid input. For example, you can have the integers 1, 2, and 3 represent the selection, or
use the words rock, paper, scissors, etc.
Check that the user entered valid input. If the entry is invalid, the program needs to inform
the user of the invalid input and can end, or re-prompt the user for their entry.
Generate a random selection for the computer's choice. You can use a random integer and
follow the same rules as was stated to the user.
-
Display…
use c++.
(a) Assume that five generation units with third order cost
function (F, (R) = A; P+ B;P+C; P; + D;) are in the circuit.
Write a computer program using any abitrary programming
longuage (MATLAB, C++, C#, Python,.) to calculate economic
load dipatch (ELD) using first order gradient method.
Note that all parameters and variables should be defined
inside the
program (at
tirst lines) such that units' characteristics
and demand can be changed easily. Neglect grid losses.
jusing dynamic programming (DP) methed.
Chapter 10 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 10.3 - Prob. 10.1PPCh. 10.8 - Practice Problem 10.2 (solution page 915) Suppose...Ch. 10.8 - Practice Problem 10.3 (solution page 915) As...Ch. 10.9 - Prob. 10.4PPCh. 10.9 - Practice Problem 10.5 (solution page 916) Assuming...Ch. 10 - Prob. 10.6HWCh. 10 - Prob. 10.7HWCh. 10 - Write a version of the statcheck program in Figure...Ch. 10 - Consider the following invocation of the...Ch. 10 - Prob. 10.10HW
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