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computer sciences
operating system

Questions and Answers of Operating System

What do you think would happen if you forgot to place a HALT instruction at the end of a machine-language program? How would the Control Unit react? Use the simulator to test your prediction, then
What sequence of assembly-language instructions corresponds to the machine language instruction set from Exercise 14.7?
What sequence of assembly-language instructions corresponds to the machine language instruction set you wrote in Exercise 14.9? Refer to Exercise 14.9, What sequence of machine-language instructions
Write a sequence of assembly-language instructions that multiplies the contents of memory location 10 by four. For example, if the number 10 were stored in memory location 10, executing your
Describe the settings that would cause the value stored in R2 to be doubled?
How many cycles are required to add the contents of R0, R1, and R2 and then place the sum in R3? Describe the settings for each cycle.
What settings would result in the sum of registers R0 and R3 being stored in memory location 4?
What settings would cause the contents of memory address 4 to be copied into register R0?
Assuming that data can be copied to and from main memory in a single CPU cycle, how many cycles are required to add the contents of memory addresses 5 and 6 and then store the result in memory
What task would the following machine-language program perform? 0: 1010001000000000 1: 1000001000000011 2: 1111111111111111
What sequence of machine-language instructions would cause the contents of the four registers to be copied into memory locations 7, 8, 9, and 10, respectively?
What sequence of machine-language instructions would cause the simulator to add the contents of memory locations 10, 11, and 12 and then store the result in memory location 13?
Machine languages are machine-specific, meaning that each type of computer has its own machine language? Explain why this is the case.
Within the control unit, what is the role of the program counter (PC)? That is, how is the PC used in fetching and executing instructions?
In a stored-program computer, both instructions and data are stored in main memory. How does the Control Unit know where the program instructions begin? How does it know where the instructions end?
Describe two advantages of assembly languages over machine languages?
Enter the strdemo.html text from Figure 15.2 into a new Web page, then load this page to verify that it behaves as described.After experimenting with strdemo.html, augment the page so that a
Consider the following code segment, which removes all spaces and punctuation marks from a given phrase. The first statement performs a search to determine whether the phrase contains a space or
Design and implement a Web page named pal.html that tests whether a word or phrase is a palindrome. Your page should allow the user to enter a word or phrase and then display a string indicating
Add the above two assignment statements to your cipher.html page so that it properly encodes messages containing both uppercase and lowercase letters. As before, any non-letters (including spaces and
Augment your cipher.html page so that it can both encode and decode messages. You will need to define a new function named Decode, which decodes the message in the text area using the entered cipher
Consider a variation on the code in Figure 15.5, in which the string concatenation inside the while loop is reversed:str = foobar; i = str.search(/[aeiou]/); while (i != -1) {str = str.substring(0,
Design and create a Web page named phoney.html that converts alphabetic phone numbers into entirely numeric ones. Your page should allow the user to enter the number (possibly containing letters) in
Design and create a Web page named roman.html containing a text box in which the user can enter an ancient Roman numeral. When the user clicks a button, the number represented by that Roman numeral
Add elements to your roman.html page so that the user can perform the opposite conversion, translating a number into an ancient Roman numeral.[One approach to building the Roman numeral would be to
A more challenging programming exercise would be to modify your roman.html page so that it uses the modern style of Roman numerals. In this system, I can appear before V and X to represent 4 and 9,
Modify your cipher.html page from Exercise 15.15 so that it implements a rotating substitution cipher.[This should require only minimal changes to the code. After each character in the message has
Whenever you order a pizza, you are faced with the dilemma of which size to order. Is a large pizza a good deal, or would you be better off ordering two mediums?Create a Web page named pizza.html
Create a text file named string.js and enter the Capitalize function into that file. Then, modify your strdemo.html page so that it loads this library file. When the button in the page is clicked, in
Define a function named Rotate that takes a string as input and returns a copy of that string in which all characters are rotated one position to the left. This means that the second character should
Define a function named Classify that takes a string as input and then determines whether the string is a single word (containing no spaces) or a phrase (containing one or more spaces). The function
Define a function named PigLatin that takes a string as input and returns the Pig Latin translation. For example, the call PigLatin('oops') should return 'oopsway', whereas PigLatin('foo') should
Technically speaking, the Pig Latin rules that we have established apply only to words, not phrases. However, your current piglatin.html page does nothing to prevent users from entering a string
Define a function named Reverse that takes a string as input and returns a copy of that string in reverse order. For example, the function call Reverse('abcd') should return the string 'dcba'. Once
1. TRUE or FALSE? Nonmetals such as carbon and oxygen tend to be good conductors of electricity. 2. TRUE or FALSE? A semiconductor is a metal that can be manipulated to be either a good or a bad
Name three different technologies that, over the years, have served as electrical switches in computers. How were these technologies similar, and how were they different? What advantages or
Electricians commonly wear rubber shoes and gloves to protect themselves when working with live wiring. Would this suggest that rubber is an efficient or inefficient conductor of electricity? Explain
Describe the difference between an NMOS transistor and a PMOS transistor?
It is possible to develop truth tables for logic circuits, just as we did for individual gates. For example, the following logic circuit combines an AND gate and an OR gate. Complete the
The following logic circuit is similar to the one in Question 4, except that the AND and OR gates are in reversed positions. Complete the corresponding truth table by calculating the output value for
What is the sum of the binary numbers 1001012 and 10112? Show the steps you used to calculate your answer.
Explain why the circuitry for adding two 4-bit numbers must be constructed by combining full adders, rather than half-adders?
What is the total number of gates required to build a 4-bit adder? Assuming two transistors per NOT gate (as in Figure 16.8) and four transistors per AND and OR gate (as in Figures 16.9 and 16.10,
Describe how a flip-flop is able to retain the last bit value assigned to it?
Does it make any sense for both of a flip-flop's input wires to carry current at the same time? What would happen within the circuit if this were to happen?
In what way is integrated-circuit manufacturing similar to photography?
Can Moore's Law continue to hold forever? That is, can technology continue to advance at its current rate indefinitely, causing the number of transistors that fit on a microchip to double every 12 to
Assume that the following statements have assigned arrays to variables:responses = ['yes', 'no', 'maybe'];nums = [1, 2, 3, 2+1, 7*7, 2*5-1];misc = [1.234, 'foo', 7-5, true, 3, 'foo'];empty = [
Augment your stats.html page so that, in addition to displaying the counts for each dice total, the page also represents the counts as percentages of the total number of rolls. To compute each
Using your stats.html page, perform 100 dice rolls and report the results. Are your percentages close to the expected ones listed in Figure 17.14? Should they be? Now, perform 1,000 dice rolls using
Define a function named Minimum that is similar to the Average function from Figure 17.11, but that takes an array of numbers as input and returns the smallest value from that array. For example, the
When a course has numerous assignments, a kindly instructor may drop a student's lowest grade to allow for one bad day. Modify your grades.html page from Exercise 17.8 so that the lowest lesson grade
Modify your stats.html page so that it simulates repeatedly rolling a pair of eight-sided dice and then collects statistics on the dice totals obtained. Because the array of counters provides extreme
Add the SeqSearch function to the arrays.js library file, then create a Web page named seq.html that utilizes the SeqSearch function to perform sequential searches on user input. The page should
After experimenting with seq.html's sequential search capabilities, answer the following questions: • What is the minimum number of inspections required to find an item in an array using sequential
Using the array of names from the previous examples (repeated below), perform the following traces: name = ['Charlie','Dave','Jack','Jerald','Jerroll','Laura','Lois','Winnie'];
The sort method, when applied to an array of strings, returns a copy of that array in which the strings appear in alphabetical order. For example, if the variable words stored the array ['foo',
Suppose that the assignment to random-Index in the Random-One-Of function (Figure 17.2) were replaced by the following: randomIndex = RandomInt(0, list.length); Would this modification cause the
After experimenting with bin.html's binary search capabilities, answer the following questions: • What is the minimum number of inspections required to find an item in an array using binary search?
Design and create a Web page named states.html that quizzes the user on state capitals. The layout of the page is entirely up to you. However, the page should contain a text box in which the user can
Modify your states.html page so that it uses the nested array structure STATE_INFO to store the names of the states and their capitals. Then, experiment with the new version to verify that the page
For each of the following statements, draw the memory cell associated with the variable after the assignment has been made:
The first statement that follows assigns a string to variable people, whereas the subsequent four assignments split people into various arrays. For each of these statements, draw the memory cell
Create a Web page named acronym.html that derives an acronym from a given phrase. The page should load the arrays.js library file (accessible at balance3e.com/arrays.js) and contain a text box in
Modify your PigLatin function (Exercise 15.7) so that it can translate entire phrases of words into Pig Latin. Similar to the Acronym function from Exercise 17.5, your function should break the input
Enter the average.html text from Figure 17.12 into a new Web page, then load this page to verify that it behaves as described. What happens if you click on the button without entering any numbers in
Re-implement your grades.html page from Chapter 7 (Exercise 7.4). Instead of requiring users to provide pre-computed averages, your modified page should provide text boxes in which users can enter a
Design and create a Web page named stats.html that simulates a number of dice rolls and displays statistics on those rolls. The user should be able to specify the number of dice rolls via a text box
1. TRUE or FALSE? Computer technology has greatly impacted the banking industry, to the extent that credit cards and debit cards have reduced consumers' reliance on cash. 2. TRUE or FALSE? Embedded
Describe two advantages of online newspapers over their print counterparts. Do you think that electronic newspapers will completely replace printed papers in the near future? Why or why not?
Utilize a search engine to research and answer the following questions. Identify the site at which you obtained your answer, as well as the search parameters you used to locate the page. • Who

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