Answer:
The correct answer for the given question is Integer.parseInt( string variable );
Explanation:
Integer.parseInt( string variable ); is the method in a java programming language that convert the string into the integer value. It takes a string variable and converted into the integer.
Following are the program in java which convert the string value into an integer value.
class Main
{
public static void main(String []args) // main function
{
String str1 = "10009";
// variable declaration
int k = Integer.parseInt(str1);
// convert the string into integer.
System.out.println("Converted into Int:" + k);
}
}
Output:
Converted into Int:10009
Convert.toInt( stringVariable );
Convert.parseInt( stringVariable,Integer.toInt( stringVariable ); are not any method to convert the string into integer .
Therefore the correct answer is :Integer.parseInt( stringVariable );
Discuss the purpose of these Windows CLI commands
Answer:
The window CLI command in the computer is basically stand for the command line interface. The command line interface is basically define as interacting with the various computer programs where the users use the command in the program by using various command lines.
The basic purpose of the CLI commands is that it takes less resources of the computer system. In earlier year of the computing this command used as a standard way for interacting with the computer other than mouse.
The command line interface (CLI) is basically handle the interface of the program. It is also known as command line processor.
How can hidden terminals be detected in 802.11?
Answer:
Hidden terminal are basically known as hidden node that are out of the range in the network. The hidden terminal are basically detected by the receiver and sender according to the potential colliding of the packets. In the wireless network 802.11 we can easily detect the hidden node or terminal by using two main mechanism that are:
Active detectionPassive detectionActive Detection:
In the active detection, the hidden terminal firstly generated a request in the hop which is known as "Detection request" and then all the given terminal received the request for sending the sequence of packet on the hop. In the 802.11 wireless network, terminal 0 is known as the detection terminal.
Passive detection:
In the passive detection, there is detecting terminal node interface is set in the promiscuous mode in which all the packets are process in the detecting terminal.
It is basically depend upon the CTS or RTS that is used for the transmitting the neighboring node or terminal.
When you open a stream for both reading and writing files, what must you always remember to do at the end?
Answer:
When you open a stream for both reading and writing you must always remember to close the stream.
Explanation:
There are three basic steps to follow to read and write data from stream.
Steps to read data from the stream
1) Open the stream
2) Read the data from the stream
3) Close the stream
Step to write data to the stream
1) Open the stream
2) Write the data to the stream
3) Close the stream
A sine wave has a period of 5 msec. What is the frequency?
Answer:
200 Hz
Explanation:
The period of a sine wave is 5 milliseconds.
That means the each cycle in the wave takes up 5 milliseconds.
So the frequency of the wave is the inverse of the time period, namely, 1/(5 * 10 ^ -3)
=1000/5 = 200 per second or 200 Hertz.
So the frequency of the wave will be 200 Hertz which means that the wave will complete 200 cycles per second. Larger the time period, lower is the frequency and vice versa.
Final answer:
The frequency of a sine wave with a period of 5 msec (milliseconds) is 200 Hz, meaning it oscillates 200 times per second.
Explanation:
A sine wave with a period of 5 msec (milliseconds) is being discussed. The frequency, which is the measure of how many times a cycle of the wave occurs in one second, can be calculated using the relationship where frequency (f) is the inverse of the period (T). Given f = 1/T, and understanding that 1 millisecond (msec) is equal to 0.001 seconds, a period of 5 msec converts to 0.005 seconds.
Therefore, the frequency of the sine wave is calculated as 1 / 0.005 s = 200 Hz. This means the sine wave oscillates 200 times per second.
If variable x has value 2 and y has value 2, what is the value of the following Jack expression?
(x + 3) / (4 - y)
Answer:
The value of the following expression is "2".
Explanation:
Here x has value 2 means x=2,and y has value 2 means y=2.
so (x+3)/(4-y)
(2+3)/(4-2)
5/2 it gives 2 because /(slash) operator gives the quotient part .The slash operator divide the left hand operand by the right hand operand.On dividing 5/2 it returns integer value i.e 2.
python programming The jackpot of a lottery is paid in 20 annual installments. There is also a cash option, which pays the winner 65% of the jackpot instantly. In either case 30% of the winnings will be withheld for tax. Design a program to do the following. Ask the user to enter the jackpot amount. Calculate and display how much money the winner will receive annually before tax and after tax if annual installments is chosen. Also calculate and display how much money the winner will receive instantly before and after tax if cash option is chosen.
Answer:
#here is code in python
#read the jackpot amount
amount=float(input("please enter the jackpot amount:"))
#read choice of payment
user_choice=input("enter your choice of payment(1 for cash, 2 for installments):")
#if choice is cash
if user_choice=='1':
#instant amount before tax
b_tax=amount*.65;
#instant amount after tax
a_tax=(amount*.70)*.65;
print("instantly received amount before tax : ",b_tax)
print("instantly received amount after tax : ",a_tax)
#if choice is installment
elif user_choice=='2':
#installment amount before tax
b_tax=amount/20;
#installment amount after tax
a_tax=(amount*.70)/20;
print("installment amount before tax : ",b_tax)
print("installment amount before tax : ",a_tax)
Explanation:
Read the jackpot amount from user.Next read the choice of Payment from user. If user's choice is cash then calculate 65% instantly amount received by user before and after the 30% tax.Print both the amount.Similarly if user's choice is installments then find 20 installments before and after 30% tax.Print the amount before and after the tax.
Output:
please enter the jackpot amount:2000
enter your choice of payment(1 for cash, 2 for installments):2
installment amount before tax : 100.0
installment amount before tax : 70.0
Discuss trends in cellular data transmission speeds
Answer:
There are various types of cellular data with the different transmission speeds that are: 1G,2G,3G and 4G.
1st generation network:
The 1st generation network is known as cellular network data transmission that contain analog system. It has 2.4kbps speed range. It is widely used in various services like public voice.
2nd generation network:
The second generation network is basically based on the digital system. The global positioning system (GSM) is one of the important service in the 2nd generation network. It basically provide different types of services that are:
GSM provide upto 2.5G range of speed and GSM EDGE upto 23kbps services.
3rd generation network:
It the wireless service that is basically based on the digital system. It provide various types of services like mobile interne, video calling and wireless type of telephones.
4th generation network:
It is one of the high digital data transmission rate and it is basically represented as the LTE. The 4G provide many types of services like multimedia services and telephone and gaming services.
Answer:
Worldwide, operators and manufacturers like Samsung, Xiaomi, LG, Motorola, ZTE or Huawei are adapting equipment to offer consumers this kind of revolutionary connectivity that comes to the market.
The expectation that we are facing a technological breakthrough is because 5G has the potential to change the way we use the internet.
If 4G and its variations allowed us to connect people, 5G will allow us a much broader connection to the things around us. Your phone, for example, will probably be faster than your home's wifi.
The speed of 4G, which is probably within your grasp right now, is 1 Gbps per second. The new network, at its full potential, will be able to deliver a standard speed of 20 Gbps per second, according to UK regulator Ofcom.
What does this mean in practice? How long does it take to download a 5G video? And watch a movie in streaming?
Downloading a 1-hour playlist on Spotfy took about 7 minutes with 3G, 20 seconds with 4G, and with 5G that time would be 0.6 seconds.
If you want to take a movie to watch while you're on the go - offline - service offered by platforms like Amazon Premium or Netflix - it will take you 3.7 seconds to download it while spending about 2 minutes on 4G .
The popular Fortnite game takes 14 minutes to download using 4G technology and the expectation is that with 5G it will take 24 seconds.
In terms of speed, one of the key factors is called latency, ie the network's responsiveness to a request.
With 5G, it will be reduced to one millisecond - a significant gain compared to the 20 seconds of the 4G network.
It's an essential factor "for activities such as broadcasting a live game in virtual reality or for a surgeon in New York to control a pair of robotic arms performing a procedure in Santiago," explains the next-generation networking optics expert, Abraham Valdebenito in an article.
In short, we can send and receive data almost instantly.
Write a java program that will take 2 String inputs and perform the following operation on them: a) Show length of the strings b) Concatenate two strings c) Convert those two strings to uppercase.
Answer:
// here is code in java.
import java.util.*;
// class definition
class Solution
{
// main method of the class
public static void main (String[] args) throws java.lang.Exception
{
try{
// scanner object to read input from user
Scanner scr=new Scanner(System.in);
// string variables
String st1,st2;
System.out.print("enter the first string:");
// read the first string
st1=scr.nextLine();
System.out.print("enter the second string:");
// read the second string
st2=scr.nextLine();
// part (a)
// find length of each string
System.out.println("length of first string is: "+st1.length());
System.out.println("length of second string is: "+st2.length());
//part(b)
// concatenate both the string
System.out.print("after Concatenate both string: ");
System.out.print(st1+st2);
// part(c)
// convert them to upper case
System.out.println("first string in upper case :"+st1.toUpperCase());
System.out.println("second string in upper case :"+st2.toUpperCase());
}catch(Exception ex){
return;}
}
}
Explanation:
Read two strings st1 and st2 with scanner object.In part a, find the length of each string with the help of .length() method and print the length.In part b, concatenate both the string with + operator.In part c, convert each string to upper case with the help of .toUpperCase() method.
Output:
enter the first string:hello
enter the second string:world!!
length of first string is: 5
length of second string is: 7
after Concatenate both string: hello world!!
first string in upper case :HELLO
second string in upper case :WORLD!!
. When does Groupthink occur?
Answer:
The group-think is the phenomena which basically occur when the group of people reached conses without any critical reasoning and also without evaluating any consequences.
It is basically based on the common desire and it occur without disturb and upset the group of people.
There are many causes of the group think that are:
Due to the group cohesivenessIt causes due to rigid leadership and various decisions stress.Due to overall group isolationAssume you have taken another square picture with the 25-megapixel digital camera discussed in the previous question. This time around you decide to view the picture on your computer screen that can display 2000 pixels by 1000 pixels. What fraction of the image is viewable on the screen? Tnoo
Answer:
8% of the picture
Explanation:
Given:
Square picture pixels = 25 MP
Pixels that can be displayed by the computer = 2000 pixels by 1000 pixels
or
Pixels that can be displayed by the computer = 2000000 pixels
Now,
The fraction of picture viewable on the screen = [tex]\frac{\textup{2MP}}{\textup{25MP}}[/tex]
or
The fraction of picture viewable on the screen = 0.08
or
The fraction of picture viewable on the screen = 8% of the picture
In Windows, the only was to start/stop MySQL Server is from the Command Prompt.
(a) True
(b) False
Answer:
False
Explanation:
There is a way to start/stop MySQL server using the Services application, with the following steps:
1. Open Run Window by Winkey + R
2. Type services.msc
3. Search MySQL service based on version installed
4. Click on stop, start, or restart the service on the right side of the panel
On Windows 10, steps 1 and 2 can be replaced by simply going to the start menu and type services, the services application will appear as first option.
supppose we already have a list called words, containing all the words(i.e., string).Write code that produce a sorted list with all duplicate words removed. For example, if words ==['hello', 'mother','hello','father','here','i','am','hello'], your code would produce the list ['am','father','hello','here','i','mother'].
Answer:
I will code in Javascript.
//define and initialize both arrays.
var words = ['hello', 'mother','hello','father','here','i','am','hello'];
var sortedList = [];
for ( var i = 0; i < words.length ; i++ ){ //loop used to go throght the words
var duplicated = false; // boolean used for detect duplicates
for ( var j = i + 1; j < words.length ; j++ ) { //loop used to compare with other words
if( words[i] == words[j] ) { //if the word is duplicated, duplicated becomes true.
duplicated = true;
break;
}
}
if (! duplicated) { //if at the end of the loop of each word duplicated is false, then the element is pushed into sortedList.
sortedList.push(words[i]);
}
}
sortedList.sort(); //when the loop is finished, use the Javascript method to sort an array.
Convert the binary number into a hexadecimal number.
Explanation:
A binary number is converted to hexadecimal number by making a group of 4 bits from the binary number given.Start making the group from Least Significant Bit (LSB) and start making group of 4 to Most Significant (MSB) or move in outward direction.If the there are less than 4 bits in last group then add corresponding zeroes to the front and find the corresponding hexadecimal number according to the 4 bits.For example:-
for this binary number 100111001011011.
100 1110 0101 1011
There is one bits less in the last group so add 1 zero(0) to it.
0100 1110 0101 1011
4 E 5 B
100111001011011 = 4E5B
101011.1010
0010 1011 . 1010
2 B A
=2B.A
What are the testing levels?
Answer:
There are different levels of the testing that are:
Unit testing:
The unit testing basically test the individual components in the software testing. It is the small testable part in the software that is used for testing.
Integration testing:
It basically test the integrated components in the software testing. The integration testing evaluate the specific requirement and functionality of the system.
System testing:
The system testing involve with the process of testing the entire system in the software testing. It basically evaluate the entire system and its specific requirement in the software system testing.
. Which of the following is a command in MySQL for creating a database called 'game_data'?
(a) INSERT DATABASE game_data;
(b) CREATE DATABASE game_data;
(c) MAKE DATABASE game_data;
(d) NEW DATABASE game_data;
Answer:
The correct option for the following question is option(b) i.e CREATE DATABASE game_data;
Explanation:
The CREATE command is used to create the database in MySQL .The syntax for creating a database is given as
Create database database name ;
Here database name is game_data
So the query is CREATE DATABASE game_data;
Insert command is used for inserting the value into database not for creating the database .so option(a) is wrong .
MAKE and NEW are not any command so these both the option are wrong.
Therefore the correct answer is option(b);
Write a recursive function using pseudocode or C/C++.
Answer:
long fact(int n)
{
if(n<=1)//base case
return 1;
long p=fact(n-1);//recursive call.
return n*p;//returning the factorial.
}
Explanation:
Above written function is written in C++ language.It is a recursive function to find the factorial of the function.
If we enter a number equal to or less than 1 then the function returns 1. Then the recursive call is made and it is stored in the long variable p and the result is returned as n*p.
Write a C++ program that stores the integers 50 and 100 in variables and stores the sum of these two in a variable named total. Display the total on the screen.
Answer:
Following are the program in c++
#include <iostream> // header file
using namespace std; // namespace
int main() // main function
{
int a=50,b=100,total; // variable declaration
total=a+b; // sum of the two variable a and b
cout<<"The total is:"<<total; // display total
return 0;
}
Output:The total is:150
Explanation:
In this program we have declared two variable i.e "a" and "b" of int type which store the value 50 and 10 respectively.After that we adding these two variable and store the sum in total variable finally display the total
CRM systems provide an organization with an important element: all employees of the company who directly or indirectly serve a customer are "____."
in the same category
in the same department
in the same division
on the same page
Answer: On the same page
Explanation:
The CRM is basically stand for the customer relationship management that are design to support all the relationship with the customers. It basically analysis the data about the customers to improve the relationship and growth in the organization.
All the employees in the organization are directly and indirectly server the customers are basically o the Same page by the individual computers.
The CRM approach are basically compile the given data from the different communication source such as company website, email and telephone.
Why is wider channel bandwidth good?
Answer:
The wider channel bandwidth is efficient and good as it help in increasing the speed of the transmission. Due to the wider channel of the bandwidth it also lead to consuming less energy of the battery and make cost effective.
Due to the wider bandwidth, the number of clients can easily share and transfer the data in the channel and also make the transmission complete.
If the channel of the bandwidth is double then, the single transmission can easily carry more data. Hence, it also lead to double the speed of the transmission.
Which of the following is the best reason to use a macro?: *
a. You want to send a personalized form email to many people
b. You want to correct the citations in a research paper
c. You want to automate a repetitive task to save time
d. You want to build a table based on an Excel spreadsheet
Answer:c)You want to automate a repetitive task to save time
Explanation: Macro is the program that is utilized when there is a requirement of a task or operation to be repeated in a automatic way.This helps in saving the time without commanding the same operation to take place manually.
This program works by taking the into and generating the preset output sequence. Other options are incorrect because it does not help in email functions, correction of the citation in documents or generation of the table.Thus, the correct option is option(c).
The use of macros is best suited for automating repetitive tasks, which saves time and increases efficiency, especially in applications like Excel. C is correct.
The best reason to use a macro is to automate a repetitive task to save time. Macros are used to streamline activities such as data entry in Excel, through repetitive tasks like keyboard shortcuts or Automatic Completion. These utilities are designed for users to quickly navigate worksheets and automate tasks; thus, eliminating the need to perform monotonous actions.
Automation in general allows you to focus on more important activities rather than getting bogged down with tedious tasks. For instance, you might use macros to write little programs for formulas you use frequently, adding efficiency to your workflow.
. The __________ logical operator works best when testing a number to determine if it
is outside a range.
Answer:
The OR logical operator works best when testing a number to determine if it is outside a range
Explanation:
The answer to this statement is:
The OR logical operator works best when testing a number to determine if it is outside a range
The concept of logical operators is simple. They allow a program to make a decision based on multiple conditions
The AND (&&) operator is used to determine whether both operands or conditions are true
The NOT (!) operator is used to convert true values to false and false values to true. In other words, it inverts a value
The OR ( || ) operator is used to determine whether either of the conditions is true. If the first operand of the || operator evaluates to true, the second operand will not be evaluated.
Write an if statement that assigns 100 to x when y is equal to 0.
Answer:
if(y==0)
{
x=100;
}
Explanation:
The above written if statement is for assigning 100 to x when the value of y is equal to 0.To check the value of the y I have used equal operator == which returns true when the value on it's left side is equal to the value to it's right else it returns false and for assigning the value to y I have used assignment operator =.
First it will be checked that the value y is equal to 0.If the then it return true means the if statement will execute.Inside if statement 100 is assigned to x.
python
if y == 0:
x = 100
This code assigns 100 to `x` when `y` equals 0. It uses an `if` statement to check the condition (`y == 0`) and performs the assignment accordingly.
In Python, an `if` statement can be used to conditionally assign a value to a variable. Here’s how you can assign 100 to `x` when `y` equals 0:
python
if y == 0:
x = 100
In this code:
- `if y == 0:` checks if the variable `y` is equal to 0.
- If the condition (`y == 0`) is true, then the statement `x = 100` is executed.
- If `y` is not equal to 0, `x` will remain unchanged (assuming it has been previously defined).
This construct is straightforward: it assigns 100 to `x` only when `y` meets the specified condition. If you need `x` to have a default value when `y` is not 0, you should define `x` beforehand or provide an `else` clause to handle other cases. For example:
python
if y == 0:
x = 100
else:
x = default_value # define default_value according to your needs
This ensures `x` always has a defined value, depending on the value of `y`.
Use the find command to display all files owned by the user guru
Answer:
find * -user guru
Explanation:
find is the command to search in files and the flag -user allow search by the owner of the file
the symbol * is a regular expression that means all the files
Example
find * -user guru
find all the files owned by the user guru
What is a relationship? A one-to-many relationship
Answer:
In the database, a relationship is the situation where one foreign key table are basically get references from the other primary key table.
The relationship basically allow relational database to splitting and storing the data into different tables.
One to many relationship is one of the type of the relationship. The one to many relationship is basically define as when the record in the table are associate with the one and more records in the another table.
What are the benefits of using an ordered list vs. an unordered list? What are the costs?
Answer:
The main benefit of the ordered list is that you can apply Binary Search( O( n log n) ) to search the elements. Instead of an unordered list, you need to go through the entire list to do the search( O(n) ).
The main cost of the ordered list is that every time you insert into a sorted list, you need to do comparisons to find where to place the element( O( n log n) ). But, every time you insert into an unsorted, you don't need to find where to place the element in the list ( O(1) ). Another cost for an ordered list is where you need to delete an element, you have an extra cost rearranging the list to maintain the order.
Constructors are special methods included in class definitions. a. What is a constructor used for? b. How do constructors differ from other methods in a class?
Answer:
(a)A constructor is a special method which is used the initialize the class that means the initialize the object of a class.
(b)There is the following difference between constructor and method in a class.
1. Constructor name has the same name as the class name we do not give any other name to the constructor, on the other hand, it is possible in function to giving any name to function.
2. The constructor does not have return type such as int, void, etc on the other hand function must have a return type.
3.constructor does not return any value on the other hand function are returning the value.
Explanation:
Following are the program of constructor in c++
#include <iostream> // header file
using namespace std; // namespace
class constructor1
{
public:
constructor1() // default constuctor
{
cout<<" hello brainly:"<<endl;
}
void fun() // fuuction
{
cout<< "function:";
}
};
int main() // main function
{
constructor1 ob; // creating object it call default constructor
ob.fun();// calling the function fun()
return 0;
}
Output:hello brainly:
function:
In this program, we create a class and create a function "fun" and "default "constructor "from the main function we create the object of a class which calls the default constructor and with the help of object we call the function fun.
Final answer:
Constructors are special methods for initializing new objects in a class. They differ from other methods by being called automatically during object creation, having no return type, and generally sharing the class name.
Explanation:
Constructors are special methods included in class definitions whose primary role is to initialize new objects of that class. Unlike regular methods, a constructor is called automatically when an instance of the class is created. They are unique in that they don't have a return type, not even void, and they often have the same name as the class in many programming languages.
Constructors may include parameters that allow for the setting of instance variables when an object is instantiated. This ensures that the new object starts with a valid state. In languages such as Python, the constructor method is defined using the special name __init__. This method enables coders to carry out any initialization, such as setting default values for instance variables or performing operations vital to the object's use.
While other methods in the class can be invoked using the object's reference and can have any return type or none, the constructor is unique in that it doesn't need to be called directly; it's invoked when the object comes into existence and cannot be called again unless a new object is created.
As the period of a sine wave decreases, the frequency __________________ .
a. decreases b. increases c. remains the same d. doubles
Answer:
b. increases
Explanation:
As the time period of a sine wave decreases, the frequency increases.
Frequency and time period follow an inverse relationship. Larger the time period, lower is the frequency and vice versa. Frequency measure the number of repetitions of the wave per unit time. Time period measures the time taken to complete one cycle of the sine wave. So larger the time to complete one cycle, smaller will be the number of cycles completed in unit time.
As the period of a sine wave decreases, the frequency **increases**. So, the answer is **b. increases**.
As the period of a sine wave decreases, it means that each cycle of the wave takes less time to complete. Frequency is the number of cycles of a wave that occur in a unit of time.
Therefore, when the period decreases, more cycles occur in the same amount of time, leading to an increase in frequency. Mathematically, frequency (f) is the reciprocal of the period (T), so as T decreases, 1/T increases, resulting in an increase in frequency.
This relationship is described by the equation f = 1/T. Hence, as the period decreases, the frequency of the sine wave increases. Therefore, option **b. increases** is the correct choice.
If you declare a variable as an instance variable within a class, and you declare and use the same variable name within a method of the class, then within the method, a) the variable used inside the method takes precedence b) the class instance variable takes precedence c) the two variables refer to a single memory address d) an error will occur
Answer:
Option(a) is the correct answer for the given question.
Explanation:
If we declared a variable with the same name in class and method both then the variable which is declared inside the method overrides the definition of variable which is declared in class .It means the variable which is used inside the method takes precedence.
For example:
public class Main
{
int c=90; // class varaible or instance varaible
void sum1()
{
int c=4; // method having same name as class varaible name
c=c+10;
System.out.println(c);
}
public static void main(String[] args)
{
Main ob=new Main();
ob.sum1();
}
}
Output:
14
In this example the variable 'c' is declared in both class and function but variable c takes the precedence inside the method sum1() and display 14.
When a variable is declared as an instance variable within a class and the same variable name is declared and used within a method of the class, the variable used inside the method takes precedence over the class instance variable.
Explanation:When a variable is declared as an instance variable within a class, and the same variable name is declared and used within a method of the class, the variable used inside the method takes precedence over the class instance variable. This is because local variables within a method have higher priority than instance variables in terms of accessing and modifying their values. The local variable and instance variable are separate and refer to different memory addresses.
A circuit-switching scenario in which Ncs users, each requiring a bandwidth of 10 Mbps, must share a link of capacity 150 Mbps. What is the maximum number of circuit-switched users that can be supported?
A(n) ____ can be a spreadsheet showing all the costs to be incurred by the system and all the benefits that are expected from its operation.
Answer: Cost or benefit analysis
Explanation: Cost or benefit analysis is the technique that is carried out in the business organization for the evaluation and testing of the decision, process and functioning. This method helps in the calculation of the benefits regarding the cost.
Cost analysis can evaluate the benefit of the cost as well as the deduction of the cost from benefits gained.It is used for making the decision related with finance in a particular organization.