Answer: D) Task-centered design
Explanation: Task centered design is the technique for a design to made in such a way that it can have the desired or expected result . The goals are set in it and the task is decided in a particular structure. Thus a design having any such system , it is known as task centered design. It is mainly focused on the user and the way this design can be used by them.
What will the following code display?
int number = 6
int x = 0;
x = --number;
cout << x << endl;
1. 7
2. 6
3. 5
4. 0
Answer:
5
Explanation:
The operator '--number', it is a pre decrement operator which decrement first and then assign. It decrement the value by 1.
initially the number is 6.
x is 0.
then, x = --number;
it decrement the number by 1 first and then assign to x.
so, x assign the value 5.
finally, print the value.
Therefore, the answer is 5.
Methods used with object instantiations are called ____ methods.
a.
accessor
b.
instance
c.
internal
d.
static
Answer:
b. instance
Explanation:
Methods used with object instantiations are the instance methods. When a class is instantiated we get a reference to the object. Invoking a method on the object , executes the corresponding instance method.
For example:
String s = new String("test");
int len = s.length();
Here length() is an instance method of String object s.
Please explain external hashing, B-trees, and traversals. 3-5 sentences per
Answer: In external hashing the hash table is in disk where each slot of the page table holds multiple entries which refers to pages on the disk organised in the form of buckets.
B-trees are self balancing trees which contains sorted data and allows insertion, deletion, traversals
Traversal is the process of visiting the nodes of the tree data structure.
Explanation:
External hashing is different from internal hashing and it refers to concepts in database management systems. Internal hashing stores only single record maintained in page table format, whereas external hashing holds multiple entries.
B-trees are generalisation of binary trees where it can have more than 2 children.
Traversal of trees helps in insertion, deletion, modification of nodes in tree data structure
write an algorithm that gets the price for item A plus the quantity purchased. The algorithm prints the total cost, including a 6% sales tax.
Answer:
Algorithm()
1. p = Enter the price of item A.
2. c = Enter the number of A’s purchased.
3. Now the price per item with tax is:
t= p+(p*6/100)
4. The total cost of c items:
ct= t * c.
5. Print ct.
In this algorithm, we are taking the price per item and counting it’s cost including tax. Then we are multiplying the price per item with tax with the number of items we purchase, to find the overall cost with tax.
You may calculate the overall cost without tax as (p*c). Then you can find the overall cost with tax as ((p*c)+(p*c*6/100)), as in both way, we will get the same result.
Final answer:
To calculate the total cost of an item including a 6% sales tax, multiply the price of item A by the quantity purchased to get the total price before tax. Then calculate the sales tax by multiplying the total price by 0.06 and add this to the total price to get the total cost.
Explanation:
To write an algorithm that calculates the total cost of an item including sales tax, you need to first find the price of the item A and the quantity purchased. Then, to calculate the sales tax, you will convert the percent to a decimal and multiply it by the total price (price multiplied by quantity). Lastly, you will add this sales tax to the total price to get the total cost.
Algorithm:
Get the price of item A.Get the quantity of item A purchased.Calculate total price without tax: total_price = price_of_item_A * quantity_purchased.Calculate sales tax: sales_tax = total_price * 0.06.Calculate total cost including sales tax: total_cost = total_price + sales_tax.Print the total_cost.For example, if the price of item A is $50 and the quantity purchased is 2, then the total cost before tax is $100. The sales tax at 6% would be $6. Therefore, the total cost including sales tax would be $106.
Write a program that gets a list of integers from input, and outputs the integers in ascending order (lowest to highest). The first integer indicates how many numbers are in the list. Assume that the list will always contain less than 20 integers. Ex: If the input is:
Answer:
integers=[]
while True:
number=int(input())
if number<0:
break
integers.append(number)
print("",min(integers))
print("",max(integers))
Explanation:
Given the IP address and subnet mask 192.168.10.0 and255.255.255.224
a) What is the maximum number of subnets in the network?
b) What is the number of hosts?
c) What are the valid subnets?
It is requested pls.give details how u have calculated?
Answer:
a) Maximum subnets=8
b) if there is no subnet , no. of hosts will be 32-2 = 30. If there are 8 subnets as above, then no. of hosts will b 4-2=2.
c) Valid subnets are 6
192.168.10.32
192.168.10.64
192.168.10.96
192.168.10.128
192.168.10.160
192.168.10.192
Explanation:
a) Maximum number of sub nets in the network
For number of sub nets in a network , which class this ip address belongs to
IP address 192.168.10.0
subnet mask 255.255.255.224
192 in ip address means it is a class C address.
In class C address -
Network address-24 bits
Host address-8bits
For number of subnets we check last block of subnet mask.
224 -covert this into binary
11100000
From binary form ,we can conclude that 3 bits are used for sub network as only 3 are 1.
=2^n
= 2^3 =8
b) Number of hosts
In a network,
Number of hosts is (2^host no -2)
We have subtracted 2 because out of these hosts two are used in broadcasting and other purposes.
Host number is equal to the 0's in the Subnet mask
255.255.255.224
convert this into binary number i.e
11111111.11111111.11111111.11100000
So,5 0's are there
Number of valid hosts= 2^5 -2
= 32-2
= 30
c) The Valid subnets are
For valid we have to perform Logical AND with IP Address and subnet mask.
IP address 192.168.10.0
subnet mask 255.255.255.224
Convert these in binary -
IP address 11000000.10101000.00001010.00000000
Subnet mask 11111111.11111111.11111111.11100000
after performing And operation- 11000000.10101000.00001010.00000000
192.168.10.0
this is the host address
192.168.10.224 this is the broadcast address
These are the valid sub nets
192.168.10.32
192.168.10.64
192.168.10.96
192.168.10.128
192.168.10.160
192.168.10.192
Give at least 5 indicators which help to identify systems andtables as potential de-normalizationcandidates.
Answer and Explanation:
The five indicators are
There is existence of repeating groups which needs to be processed in a single group not individuallymany reports exist which need to be processed onlinetables need to processed in different way by different users at the same time certain columns need very large time for the de normalization take 60% as the alarming numbermany calculations needs to be applied to columns before queries can be answered
what are the forms of Hornclause?
Answer:
Hornclause is defines as, it is a logical formula for particular rule which gives a useful parameters for a logical programming. Hornclause is a clause with one positive literals.
Different form of hornclause are:
Null clause: Null clause is that with 0 negative and 0 positive literals which appears at the end of a resolution proof. A fact or unit clause: Unit clause is defined as literals, which contain 1 positive literals and 0 negative literals. A negated goal: It is defined as negated goal is the negation of the statements to be proved with at least 1 negative and one positive literals.As it is a good practice that C# broughtback the concept of GOTO statement and Pointer? If your answer isyes then how C# control the worst effect of those features. Pleasebe brief?
Answer:
No for GOTO
Yes for Pointer
Explanation:
GOTO statement
This declaration is used to pass control to the program's marked declaration. The label is the valid identifier and is positioned just before the declaration from which the control is transmitted.
It becomes hard to trace a program's control flow, making it hard to comprehend the program logic. Any program in C language can be written without using a GOTO statement.
Pointers
A C # pointer is nothing but a variable holding another type of memory address. However, in C # pointer only the memory address of the value types and arrays can be declared.
C # supports pointers to a restricted extent. Unlike reference kinds, the default trash collection system does not track pointer kinds. Pointers are not allowed to point to a type of structure containing a type of reference or a type of reference.
During the garbage collection process, the C #garbage collector can move objects in memory as they wish. The C #offers a unique fixed keyword for telling Garbage Collector not to move an item. This implies that the place of the value kinds referred to is fixed in memory. This is called pinning in C #.
The GOTO statement and pointers in C# can simplify some coding tasks but can also make the code harder to read and C# controls these downsides by offering structured programming constructs and by restricting pointer usage to unsafe contexts.
The introduction of the GOTO statement and pointers in C# can be seen both positively and negatively. While the GOTO statement allows for easier navigation and breaking out of control structures, it often results in code that is hard to read and maintain. To mitigate such issues, C# provides structured programming constructs like loops, conditional statements, and methods to manage control flow more effectively.
C# also manages the risks of pointers by requiring explicit permissions and special contexts for their usage, thus limiting their misuse.
Control Mechanisms in C#
Instead of GOTO, use loops (for, while) and conditionals (if, switch) for better readability.Pointers are only allowed in unsafe contexts to highlight potential risks.with open source operating systems,both the executable code and source code are available:
true or false?
Answer:v True
Explanation: Open source operating system is the system that has source code that can be modified and enhance them . It can also be shared between the public as it is available in the open form . There are many examples of the open source operating system like Linux, Ubuntu etc. which has both executable code and source code as well. so therefore the given statement is true.
The methods of the Character class that begin with ____ return a character that has been converted to the stated format.
a.
in
b.
to
c.
is
d.
for
Answer:
most probably the answer is 'to'
In a circular linked list the last node points to the____ node.
a. first
b. last
c. middle
d. new
Answer: option A) First
In a circular linked list the last node points to the first node.
Explanation: As in a circular linked list, the node will point to its next node. Since the node next to last node is the first node hence last node will point to first node in a circular way. The elements points to each other in a circular path which forms a circular chain.
Which of the following is the new linecharacter?\r\n\l\b
Answer:
\n
Explanation:
\n is called the new line character.It is used to go to the next line or the start of the new line.\n is used in Linux while in windows uses \r\n called carriage return.But generally \n is used in most of the programming languages also.
In java, Write a while loop that prints userNum divided by 2 (integer division) until reaching 1. Follow each number by a space. Example output for userNum = 20:
Answer:
while(userNum > 1){
userNum = userNum /2;
System.out.print(userNum+" ");
}
Explanation:
Probably don't need the print statement, but it doesn't cause an error.
This solution uses a while loop in Java to repeatedly divide a number by 2 and print the result until the number is less than 1. The example code and explanation illustrate the process clearly.
To solve this problem, you need to write a while loop in Java. This loop will continue dividing the given number by 2 until it reaches 1. Here's the step-by-step solution:
Example Code:
import java.util.Scanner;In this code:
We initialize userNum with a value (20 in this example).The while loop continues as long as userNum is greater than or equal to 1.In each iteration, we print userNum followed by a space and then divide it by 2 using integer division.The output for userNum = 20 will be: 20 10 5 2 1 .
Why do cellular telephone systems only need seven sets of frequencies in metropolitan areas?
Answer: For frequency reuse, telephone systems use 7 sets of frequencies in metropolitan areas.
Explanation:
As the population is high in metropolitan cities it requires faster reuse of frequencies so that everyone within the network region is being able to use their cellular devices. It can be imagined in the form of a hexagon with 6 points and one at the center enabling faster reuse of free frequencies.
To speed up item insertion and deletion in a data set, use ____.
A.
arrays
B.
linked lists
C.
classes
To speed up item insertion and deletion in a data set, use B. linked lists.
Hope this helps!
Final answer:
To enhance the speed of insertion and deletion in a data set, linked lists are superior to arrays as they allow for quick updates of references without needing to shift elements. Thus, option B is correct.
Explanation:
To speed up item insertion and deletion in a data set, the best choice would be B. linked lists. Unlike arrays, which require shifting elements when inserting or deleting an item particularly if it's not at the end, linked lists can efficiently add or remove items because they only need to update the references (or pointers) to the neighboring elements.
When working with a sorted linked list, the structure will maintain items in a sorted order. When inserting a new item, it determines the correct location within the order to insert, based on comparison operators like <. In Python, this can be implemented using special methods such as __lt__() and __eq__(). This comparison flexibility allows for the linked list to handle various data types including integers, floats, and strings, facilitating the sorted order efficiently.
What happens when an exception is thrown, but the try statement does not have a catch clause that is capable of catching it?
Answer:
A checked exception indicates something beyond your control has gone wrong. ... If an exception does not have a matching catch clause, the current method terminates and throws the exception to the next higher level. If there is no matching catch clause at any higher level, then the program terminates with an error.
.The process of capturing the requirements includes all ofthe following with the exception of:
A.verification B.elicitation C.analysis D.validation
Answer: A) Verification
Explanation: Capturing of the requirements is the process of which the project is taken up to test the scope that project. The capturing of requirement process is divided into certain parts to conduct the procedure as
ElicitationAnalysisValidationSpecificationTherefore there is no part of verification in the process so capturing of requirements process has a exception of verification.
What are different types of inner classes ?
Answer:
Inner class in Java is basically a class in a class, i.e. a member of another class.
There are 4 types of inner classes in Java.
a) Nested Inner class
b) Method local Inner class
c) Anonymous Inner class
d) Static nested class
Define a graph. Draw a directed and undirected graph with 8 vertices and explain all the terminologies associated with that graph Note: Terminologies are cycles, path, directed and undirected graph, circuit, loop, adjacency, degrees, Euler circuit, Hamiltonian circuit
Answer:
A graph is a collection of set of edges E and vertices V, where each edge joins pair of vertices.
A graph is undirected when the edges has no direction.
A graph is directed when the edges has confined direction.
An edge is directed if it is defined to come out from one vertex and goes to another fixed vertex.
A loop is an edge from a vertex to itself.
A path from a vertex x to another vertex y is a sequence of distinct edges that joins sequence of distinct vertices:
(x,[tex]x_{1}[/tex])→([tex]x_{1}[/tex], [tex]x_{2}[/tex])→([tex]x_{2}[/tex], [tex]x_{i}[/tex])→ .... → ([tex]x_{j}[/tex],y)
A cycle is path that starts and ends at same vertex.
A circuit is a path that starts and ends at same vertex, but not necessarily contain distinct vertices.
An Euler circuit is circuit that traverse each edge of the graph exactly once and covers all vertices.
An Hamiltonian circuit is a simple circuit that traverse each vertex of the graph exactly once and covers all edges.
Degree of a vertex is the number of edges incident on it.
In case of undirected graph the number of edges incident on the vertex is it's degree.but in case of directed graph the number of edges coming out of the vertex is it's out-degree and the number of edges going to the vertex is it's in-degree.Explanation:
What is the
stored program concept?
Answer:
The stored program concept is defined as, in the architecture of computer where computer acts as internal store instruction and it is important because has high flexibility and user does not required to execute the instruction again and again. It is basically works on the principle of Von neumann architecture, as in which the instruction and the data are both same logically and can be used to store in the memory.
Why we need each section of prologprogram?
Answer:
Prolog program are used in the artificial intelligence and the web development in a systematic manner process. As, it is also sometimes known as declarative language which basically consist of some facts and list. Prolog program are divided into the sections that are:
Domain sectionsClauses sectionsPredicates sectionsGoal sectionsWe need each section of the prolog program because all the sections introduced the systematic program and performed there particular functions so by using all these processing steps an efficient function are formed.
When mathematicians use a two-dimensional array, they often call it a ____.
a.
matrix
b.
grid
c.
net
d.
mesh
Answer:
matrix
Explanation:
The two dimensional array store the value similar to matrix.
Two dimensional array contain row and column similar to matrix.
For example:
int arr[3][3], it means 3 rows and 3 column
and [tex][A]_{3*3}=\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right][/tex]
and if we want to retrieve the data from array arr[1][2], it means first row and second column.
so, 2 dimensional array is basically a matrix.
An ____ is an object that produces each element of a container, such as a linked list, one element at a time.
A.
initiator
B.
iterator
C.
interpreter
Answer:
B. iterator
Explanation:
An iterator is an object that produces each element of a container, such as a linked list, one element at a time.
An iterator is an object that produces each element of a container, such as a linked list, one element at a time. Thus, the correct option for this question is B.
What is an element?An element may be characterized as the constituent parts of a work of computer that is an essential characteristic of all works of programming and spoken narrative fiction. These elements include plot, theme, character, and tone.
According to the context of this question, an iterator is an object that significantly enables a programmer in order to transverse a container, particularly lists. The various types of iterators considerably provide numerous interfaces to the programmer in order to develop program.
Therefore, an iterator is an object that produces each element of a container, such as a linked list, one element at a time. Thus, the correct option for this question is B.
To learn more about Iterator, refer to the link:
https://brainly.com/question/29313296
#SPJ5
Give a recursive (or non-recursive) algorithm to compute the product of two positive integers, m and n, using only addition and subtraction ?
Answer:
Multiply(m,n)
1. Initialize product=0.
2. for i=1 to n
3. product = product +m.
4. Output product.
Explanation:
Here we take the variable "product" to store the result m×n. And in this algorithm we find m×n by adding m, n times.
Where does the data go for the following instructions?
LDX #$2000
STAA $60,X
Answer: LDX copies the instruction pointed by the memory location into the accumulator. STAA stores the content of the accumulator in the memory location $
Explanation:
Here in LDA #$2000, copies the instruction pointed by the memory location $2000 into the Accumulator A, and it uses indirect addressing.
STA $60,X stores the content of A into the memory location assigned by $60 and assigns it to X.
What to do: please remember to comment each line.
1 Initialize x to be zero
2 Prompt the user for the next operation (Addition or Subtraction)
3 Prompt the user for the next operand (y).
4 Perform the operation (x + y or x – y depends on the operation selected by
the user), and store back the result to x.
5 Output x in decimal.
6 Go back to step 2 until user input “q” as the next operation, then exit.
Answer:
#include <iostream>
using namespace std;
int main()
{
//initialization
float x=0.0;
float y;
char operation;
//print the message
cout<<"Please enter the operation (Addition or Subtraction): ";
cin>>operation;
//loop for enter th operand again until enter 'q'
while(operation != 'q'){
//print the message for operand x
cout<<"\nPlease enter the operand x: ";
cin>>x;
//print the message for operand y
cout<<"\nPlease enter the operand y: ";
cin>>y;
//check for condition for '+' and if true then add the operands
if(operation == '+'){
x=x+y;
}else if(operation == '-'){ //if user enter '-' then subtract the operands
x=x-y;
}
//print the output
cout<<"\nThe output is: "<<x<<endl;
cout<<"\nPlease enter the operation (Addition or Subtraction): ";
cin>>operation;
}
return 0;
}
Explanation:
Create the main function and define the variable x equals zero and declare the variables y and operation.
print the message for the user to enter the operation ('+' or '-') by using the instruction cout.
Store the value in the variable by using the instruction cin.
Then, take the loop to repeat the statement again and again until the condition is true.
print the message inside the loop for asking about the operands from the user.
then, use condition statement for checking the operation and if condition match, then execute the particular operation.
The above operation executes until the user enters not enter the character 'q'.
when the user enters the 'q', the loop terminates and print the output.
The expressionvecCont.empty() empties the vector container of allelements.
a. True
b. False
Answer:
False
Explanation:
vector is like a dynamic array that has a special ability to resize automatically when it required.
vector has several functions:
like, insert() to insert the element in the vector.
delete() for delete the one element at a time.
empty() is also the function used in the vector. It is used for checking the vector is empty or not.
it gives the Boolean value (TRUE or FALSE), if the vector is empty it gives the output TRUE if the vector is not empty it gives the output FALSE.
It is not used for empty or deletes all elements of the vector.
Therefore, the answer is False.
Do you think there are some disadvantages to "For Loop"? Or when using it is not good for its program?
Answer:
I think there are no disadvantages of for loop as far as i know.
Since for loop is entry controlled loop (i.e , the condition is checked for entering in the loop body).So when you want to execute the body first in the program for loops are not good fit for this type of conditions.You can use do while loop in these cases which is an exit controlled loop(body is executed first after the condition is checked) .
for example:-Iterating over and printing the circular linked list.
Incomplete Configuration identification documents may resultin:
a) Defective Product
b) Higher Maintenance Costs
c) Schedule Product
d) Meet Software Quality
e) A,B,C
f) B,C,D
Answer: e) A,B,C
Explanation:
Incomplete configuration identification documents may result in defective product, higher maintenance costs and schedule product as, inaccurate document decreased the quality of the product and cause damage. If the configuration documentation are not properly identified, then it is impossible to control the changes in the configuration items, to established accurate reports and records or validate the configuration.