
MyLab Programming with Pearson eText -- Access Card -- for Introduction to Java Programming and Data Structures, Comprehensive Version
11th Edition
ISBN: 9780134672816
Author: Liang
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 5.46PE
(Reverse a string) Write a
Enter a string: ABCD
The reversed string is DCBA
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Given a shared data set, we allow multiple readers to read at the same time, and only one single writer can access the shared data at the same time. In the lecture slides, a solution is given. However, the problem is that the write cannot write forever, if there are always at least one reader.
How to ensure that the writer can eventually write? Propose your solution by using semaphores and implemented in Python
from threading import Thread, Semaphore
from time import sleep
from sys import stdout
class Reader(Thread):
def__init__(self, name):
self.n=name; Thread.__init__(self)
defrun(self):
globalnr, nw, dr, dw
whileTrue:
# ⟨await nw == 0 then nr += 1⟩
e.acquire()
ifnw>0:
#if nw > 0 or dw > 0 :
dr+=1; e.release(); r.acquire()
nr+=1
ifdr>0: dr-=1; r.release()
else: e.release()
# read data
stdout.write(self.n+' reading\n')
sleep(1)
# ⟨nr -= 1⟩
e.acquire()
nr-=1
ifnr==0anddw>0:
dw-=1 ; w.release()
else: e.release()
class Writer(Thread):
def__init__(self, name):…
Chapter 5 Solutions
MyLab Programming with Pearson eText -- Access Card -- for Introduction to Java Programming and Data Structures, Comprehensive Version
Ch. 5.2 - Prob. 5.2.1CPCh. 5.2 - How many times are the following loop bodies...Ch. 5.2 - Prob. 5.2.3CPCh. 5.3 - What is wrong if guess is initialized to 0 in line...Ch. 5.4 - Revise the code using the System. nanoTime () to...Ch. 5.5 - Prob. 5.5.1CPCh. 5.6 - Prob. 5.6.1CPCh. 5.6 - What are the differences between a while loop and...Ch. 5.7 - Do the following two loops result in the same...Ch. 5.7 - What are the three parts of a for loop control?...
Ch. 5.7 - Suppose the input is 2 3 4 5 0. What is the output...Ch. 5.7 - What does the following statement do? for ( ; ; )...Ch. 5.7 - If a variable is declared in a for loop control,...Ch. 5.7 - Convert the following for loop statement to a...Ch. 5.7 - Count the number of iterations in the following...Ch. 5.8 - Can you convert a for loop to a while loop? List...Ch. 5.8 - Can you always convert a while loop into a for...Ch. 5.8 - Identify and fix the errors in the following code:...Ch. 5.8 - Prob. 5.8.4CPCh. 5.9 - How many times is the println statement executed?...Ch. 5.9 - Show the output of the following programs. (Hint:...Ch. 5.11 - Will the program work if n1 and n2 are replaced by...Ch. 5.11 - In Listing 5.11. why is it wrong if you change the...Ch. 5.11 - In Listing 5. 11, how many times the loop body is...Ch. 5.11 - Prob. 5.11.4CPCh. 5.11 - Prob. 5.11.5CPCh. 5.12 - What is the keyword break for? What is the keyword...Ch. 5.12 - The for loop on the left is converted into the...Ch. 5.12 - Rewrite the programs TestBreak and TestContinue in...Ch. 5.12 - After the break statement in (a) is executed in...Ch. 5.13 - What happens to the program if (low high) in line...Ch. 5.14 - Simply the code in lined 27-32 using a conditional...Ch. 5 - (Count positive and negative numbers and compute...Ch. 5 - (Repeat additions) Listing 5.4,...Ch. 5 - (Conversion from kilograms to pounds) Write a...Ch. 5 - (Conversion from miles to kilometers) Write a...Ch. 5 - (Conversion from kilograms to pounds and pounds to...Ch. 5 - Prob. 5.6PECh. 5 - (Financial application: compute future tuition)...Ch. 5 - (Find the highest score) Write a program that...Ch. 5 - (Find the two highest scores) Write a program that...Ch. 5 - (Find numbers divisible by 5 and 6) Write a...Ch. 5 - (Find numbers divisible by 5 or 6, but not both)...Ch. 5 - (Find the smallest n such that n2 12,000) Use a...Ch. 5 - (Find the largest n such that n3 12,000) Use a...Ch. 5 - (Compute the greatest common divisor) Another...Ch. 5 - (Display the ASCII character table) Write a...Ch. 5 - (Find the factors of an integer) Write a program...Ch. 5 - (Display pyramid) Write a program that prompts the...Ch. 5 - (Display four patterns using Loops) Use nested...Ch. 5 - (Display numbers in a pyramid pattern) Write a...Ch. 5 - (Display prime numbers between 2 and 1,000) Modify...Ch. 5 - Prob. 5.21PECh. 5 - For the formula to compute monthly payment, see...Ch. 5 - (Demonstrate cancellation errors) A cancellation...Ch. 5 - Prob. 5.24PECh. 5 - (Compute ) You can approximate by using the...Ch. 5 - (Compute e) You can approximate e using the...Ch. 5 - (Display leap years) Write a program that displays...Ch. 5 - (Display the first days of each month) Write a...Ch. 5 - (Display calendars) Write a program that prompts...Ch. 5 - (Financial application: compound value) Suppose...Ch. 5 - (Financial application: compute CD value) Suppose...Ch. 5 - (Game: lottery) Revise Listing 3.8, Lottery.java,...Ch. 5 - (Perfect number) A positive integer is called a...Ch. 5 - (Game: scissor; rock, paper) Programming Exercise...Ch. 5 - (Summation) Write a program to compute the...Ch. 5 - (Business application: checking ISBN) Use loops to...Ch. 5 - (Decimal to binary) Write a program that prompts...Ch. 5 - (Decimal to octal) Write a program that prompts...Ch. 5 - (Financial application: find the sales amount) You...Ch. 5 - (Simulation: heads or tails) Write a program that...Ch. 5 - (Occurrence of max numbers) Write a program that...Ch. 5 - (Financial application: find the sales amount)...Ch. 5 - (Math: combinations) Write a program that displays...Ch. 5 - (Computer architecture: bit-level operations) A...Ch. 5 - (Statistics: compute mean and standard deviation)...Ch. 5 - (Reverse a string) Write a program that prompts...Ch. 5 - (Business: check ISBN-13) ISBN -13 is a new...Ch. 5 - (Process string) Write a program that prompts the...Ch. 5 - (Count vowels and consonants) Assume that the...Ch. 5 - Prob. 5.50PECh. 5 - (Longest common prefix) Write a program that...
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