Use the laws of propositional logic to prove the following:

(a) ¬p → ¬q ≡ q → p

(b) p ∧ (¬p → q) ≡ p

(c) (p → q) ∧ (p → r) ≡ p → (q ∧ r)

Final answer:

Option B (72 = amount;) is not a valid assignment statement because a constant value cannot be assigned to another value, whereas valid statements involve assigning values to variables.

Explanation:

The question is asking which of the given assignment statements in the context of a programming language is not valid. An assignment statement typically involves assigning a value to a variable.

The correct answer among the options provided is:

On the other hand, options A and C are valid assignment statements:

Answer:

Following are the program in Java

class abc // class abc

{

   public void area(int s) // function area

   {

       s=s*s;// calculate area

       System.out.println(" The area is:" +s + " ft"); // display the area

   }

    public void perimeter(int s) //function perimeter

    {

        s=4*s;//calculate perimeter.

       System.out.println(" The perimeter is:" +s + " ft"); //display the perimeter

    }

}

public class Main //class main

{

public static void main(String[] args) // main function

{

abc ob=new abc(); // creating instance of class abc

ob.area(7); // calling function area

ob.perimeter(7); // calling function perimeter

}

}

Output:

The area is: 49 ft

The perimeter is:28 ft

Explanation:

In  this program we create the class "abc" .We declared two function in the class "abc" i.e "area" and "perimeter" which is calculating the area and perimeter of a square and print them , from the main function we create a object of class "abc" i.e "ob" which called the function area and perimeter .

Answer: All the above questions should be asked

Explanation:  Access report are the reports in access which provides the summarized and formatted information display in database. The information in the database is extracted from tables.The access report requires purpose of the report before preparation and the accessing users information to be known .

It is asked to make sure about that no unauthorized access of the report can take place. Distribution of the report among the other user or client is also a major question to be asked as to keep the record of the accessing of access report..Thus, all the question mentioned in the options are correct.

Answer:

Supported by all devices,screen sizes and orientation.

Explanation:

Responsive design mostly used in Web designs.It is the approach in which the design of the web app must respond to behavior of user and the environment also based on the platform,screen size and orientation.

This should be done by using flexible grids,layouts and some smart use of CSS .

You can also use Bootstrap for responsive designs.

Answer:

The correct answer for the given question is option(A) and option(C) .

Explanation:

To declared any variable of character we using following syntax

char variable=' value';

char  letter='w';

In option(A)  their is no single quotes between character w .So this is not a valid assignment.

In option(C) their is double quotes between character w,no single quotes  between character w .So this is not a valid assignment.

In option(B) their is single quotes between character w .So this is a valid assignment.

So option(A) and option(C) are are not valid assignment statement.

A) Valid if `w` is a `char` variable.

B) Valid (`'w'` is a `char` literal).

C) Invalid (`"w"` is a `String`, not a `char` literal).

In Java, a `char` variable can only be assigned a single character enclosed in single quotes (e.g., `'a'`, `'b'`, `'w'`). Therefore, valid assignment statements must adhere to this rule.

Let's analyze each option:

A) `letter = w;`

- This statement assumes `w` is a variable holding a `char` value. If `w` is not declared as a `char` and does not represent a valid character literal, this assignment will cause a compilation error.

B) `letter = 'w';`

- This is a valid assignment statement. `'w'` is a character literal representing the character 'w'. It matches the type `char`.

C) `letter = "w";`

- This statement uses double quotes, which in Java denote a `String` literal, not a `char` literal. Therefore, this assignment will cause a compilation error because you cannot directly assign a `String` to a `char` variable.

Conclusion:

The assignment statement that is not valid to assign the letter 'w' to a `char` variable in Java is **C) `letter = "w";`**.

Answer:

void Initials(string firstName,string lastName)

{

   cout<<firstName[0];

   for(int i=1;i<firstName.length();i++)

   {

       if(firstName[i-1]==' ')

       {

           cout<<firstName[i];

       }

   }

   cout<<lastName[0];

    for(int i=1;i<lastName.length();i++)

   {

       if(lastName[i-1]==' ')

       {

           cout<<lastName[i];

       }

   }

   cout<<endl;

}

Explanation:

The above written code is the function Initials which prints the full name.Parameters provided in the function are firstname and lastname in the format of string.You should include string header file for this code to run.

Answer: framework and modelLibrary

Explanation: Stereotypes helps in the providing the control action to the class that is providing support to the other class in the  UML(Unified modeling language) model. For the package as the model element the stereotypes allowed are framework and modelLibrary.

framework stereotype applied on the package for providing due to  reusable components it persist. modelLibrary is the stereotype for the package that has reusable model elements.

Other options are incorrect because "private" and "protected" are not the stereotypes for the model element package.Thus the correct option is framework and modelLibrary.

Answer:

Social media plays a vital role in today's era, it tends to influence the web applications and their development in several ways possible, such as:

Most of the business organizations tend to have a presence on a social media platform and that is considered to be a great way of letting individuals know about your commodities, since most of the people have access to internet.  This is considered one of the reasons that most of the websites created have icons of  different social media platforms that the organization has presence on. The tendency to use icons in order to project which social platform an organization is on is turning out to be more vital for many websites today.

Final answer:

Social media platforms like are reshaping web development, with a strong influence on the dissemination of information, including political discourse.

Explanation:

Social media is significantly influencing web applications and development, reshaping how they interact with users and how content is delivered. Platforms like Face-book and Twi-tter have become central to disseminating information, including political discourse, news, and general public communication. The extensive reach of these platforms raises critical questions about their influence on political information, elections, and public policy.

Social media's impact on web development is evident in the proliferation of features that promote social sharing and connectivity. Features such as liking, sharing, and comments sections are now standard on various web applications, driven by the desire to increase user engagement and time spent on sites. Beyond these features, the backbone technologies of the internet, like Cloud Computing, are being harnessed to support the massive amounts of data generated and shared via social media.

Answer:

#include <iostream>

using namespace std;

int main() {

int a=-156;//negative integer between -1 and -255.

a*=-1;//multiplying a to -1 so that it can become positive.

cout<<a;//printing a.

return 0;

}

Explanation:

The above written program is in C++ and in the program an integer a is defined with a negative value in the program it is -156.Then to convert it to positive integer we have to multiply a to -1 after that printing the value of a on the screen.

Answer: Security holes

Explanation: Security holes are the patches in the form of vulnerabilities that occur in the antivirus software and other such software that can lead to the hacking or attacking of the system. Security holes are filled in with update as quick repair solution. During this repairing, worms as a malicious  element attacks the system.

Other options are incorrect because scripts is type of language ,applets are small applications and the files index is the index holding the data of files.Thus the correct option is security holes.

Answer: Summary information only

Explanation:

The extract report is basically design to create the various output files and contain only summary information. In the extract report we can listed and modify the data sets according top the specific requirements.

The extract report is basically used to describe the summary and specif pattern of the information or data.

The extract report is basically generated when the overall extract job is executed and submitted.  

Answer:

False.

Explanation:

Index addressing is not for only traversing the arrays but to also access the element,manipulate them.Though indexing is also used in traversing but it is not solely for that.Indexing in an array starts from 0 to size-1.

for example:-

We have an array a of size 10.So to access the element at position 6.We have to write.

a[5];

Manipulating it

a[5]=6;

Answer:

// here is code in c++.

#include <bits/stdc++.h>

using namespace std;

int main()

{

// initialize one Guinean_Francs

   double Guinean_Francs=9240.00;

   int u_s_d;

   double tot_Guinean_Francs;

   cout<<"enter the amount in U.S dollar:";

   // read the dollar

   cin>>u_s_d;

   // conver it into Guinean_Francs

   tot_Guinean_Francs=u_s_d*Guinean_Francs;

   print the output

   cout<<"total Guinean Francs is :"<<tot_Guinean_Francs<<endl;

return 0;

}

Explanation:

Declare and initialize a variable "Guinean_Francs" with 9240.00.Then read the  U S dollar from user and assign it to variable "u_s_d".Then multiply u_s_d  with Guinean_Francs and assign it to tot_Guinean_Francs. This will be the  total Guinean Francs.

Output:

enter the amount in U.S dollar:25                                                                                                                            

total Guinean Francs is :231000  

Answer:

3D ( in hexadecimal )

Explanation:

Converting the given hexadecimal numbers to decimal:

 67 (HEX) = 16*6 + 7 = 103 (Decimal)

 2A (HEX) = 2*16 + 10 = 42 (Decimal)

Subtracting the two numbers: 103 - 42 = 61 (Decimal)

Converting the result to Hexadecimal format:

61 = 16* 3 + 13

13 corresponds to D in hexadecimal.

So result in hex is 3D.

To summarize, the subtraction result for the two given hexadecimal numbers is 61 in decimal format or 3D in hexadecimal.

Answer:

 The signal is the function which that carry information about the particular phenomenon in the signal processing. A signal is also define as the change in the quantity which is observable.

In terms of telecommunication, a signal is the varying current, voltage and the electromagnetic wave which basically carries data or information. Signal can be in the form of audio, image and radar related.

A signal can be used be various signal processing system and telecommunication fr the transmission of information from one device to another device.    

Answer:

True.

Explanation:

The colon in square brackets is used to subsetting the list.

for example list1=[1,2,4,6,2,5]

print(list1[3:5])

This will print 6 ,2

Because it means the list from index 3 to 4 the last value is not inclusive.So if you write [:] it means the whole list and in the question we are assigning it to list2.So all the values from list1 will be copied to list2.

Answer:

#include <iostream>

using namespace std;

int main() {

   for(int i=33;i<=126;i++)//Using loop to print ASCII characters.

   {

         cout<<i<<char(i<<" ";//statement to print integer and it's ASCII characters with values.

   }

return 0;

}

Explanation:

Put a closing parenthesis i char(i after doing that code will run .Since the answer was not getting posted hence i have to come to this resort.

I have used for loop for values 33 to 126 and for printing the ascii characters I have used typecasting converting the integer to corresponding char forcefully.

Answer:

double rainfall[30];

Explanation:

Here we are declared an onе dimеnsional array named " rainfall "  of size 30  and type double.To declared a onе dimеnsional array we can use the following syntax.

datatype array-name[size];

So double rainfall[30];

Following are the program in c++

#include<iostream> // header file

using namespace std; // namespace

int main() // main method

{

 double rainfall[30]={45.5,78.9,67.78}; // array declaration and storing values

for(int i=0;i<3;++i) // iterating loop

{

    cout<<rainfall[i]<<endl; // printing the array elements

}

   return 0;

}

Output:

45.5

78.9

67.78

Final answer:

To find the location of any alphabetic character in a 2-character string, use two if statements to check both characters with Character.isLetter(), consider 0-based indexing while displaying a 1-based output.

Explanation:

The student is asked to write Java code that prints the location of any alphabetic character in a 2-character string called passCode. In Java, the method Character.isLetter() can be used to determine if a given character is a letter. To accomplish this task, two if statements can be used, one for each character in the string, and the indexes are 0-based. If an alphabetic character is found, the program outputs the location of the character using a 0-based index, but since users usually expect a 1-based index, we'll add one to the index before printing. Here is an example of how to write the code:

public class Main {
  public static void main(String[] args) {
      String passCode = "9a";
      if (Character.isLetter(passCode.charAt(0))) {
          System.out.println("Alphabetic at " + (0 + 1));
      }
      if (Character.isLetter(passCode.charAt(1))) {
          System.out.println("Alphabetic at " + (1 + 1));
      }
  }
}
For the string "9a", the output of this code would be "Alphabetic at 2" because 'a' is an alphabetic character at the second position (index 1).

Answer:

function sum(number) {

      if (number == 1) {

             return 1;

      }

      return number + sum(number -1);

}

Explanation:

This is a recursive function, it means that is a function that calls itself for example: if you call the function with sum(5) the process is :

sum(5)

   |______ 5 + sum(4)

                           |_______ 4 + sum(3)

                                                       |______ 3 + sum(2)

                                                                                   |_____2 + sum(1)

                                                                                                        |_____ 1

the result is 1+2+3+4+5 = 15

Answer:

//Here is the for loop in C.

for(n=10;n>0;n--)

{

   printf("count =%d \n",n);

}

Explanation:

Since C is a procedural programming language.Here if a loop that starts with n=10; It will run till n becomes 0. When n reaches to 0 then loop terminates otherwise it  print the count of n.

// here is code in C++.

#include <bits/stdc++.h>

using namespace std;

// main function

int main()

{  // variables

int n;

// for loop that runs 10 times

// when n==0 then loop terminates

for(n=10;n>0;n--)

{

   cout<<"count ="<<n<<endl;

}

return 0;

}

Output:

count =10

count =9

count =8

count =7

count =6

count =5

count =4

count =3

count =2

count =1

Answer:

The following are some steps for the object oriented designing process that are:

For example:

For implementing the flow of pipe, Firstly break the transformation into the different level of stages and then define the output and input properly between the pair of the stages. Then, differentiate the operation of each stage of the updates pipeline.

Answer: D)It relies on two independent proofs of identity.

Explanation: Two factor authentication is technique which uses two steps/stage for the verification or authentication.It is done for the extra security maintenance.IT is also known as 2FA. It consist of two different authentication component so that it penetrates through double protection layer .

Other options are incorrect because It RSA public key cannot be used for the authentication of private content. It does not use both hand geometry at same time for both the levels and It does not utilize only single sign-on technology. Thus, the correct option is option(D).

Answer: Process

Explanation: Processing data in the computing field is referred as the manipulation and transformation of data into useful output. The raw data is transformed machine language data.The processing also consist of the operations performed on data.

Other options are incorrect because decision is the final judgement made regarding computing,problem is issue in system and system is the complete unit in which processing takes place.Thus, the correct option is process.

Answer:

False.

Explanation:

The statement #include<math.h> means it is telling the compiler to include the the C language library math.h. It contains different math mathematical functions such as pow,ceil,floor,log,log10 etc.

#include is a preprocessor directive and it is used to paste the code the file that is provided in the #include to the current file.

Answer:

The statement #include<math.h> means it is telling the compiler to include the the C language library math.h. It contains different math mathematical functions such as pow,ceil,floor,log,log10 etc.

#include is a preprocessor directive and it is used to paste the code the file that is provided in the #include to the current file.

Explanation:

there is the link https://study.com/academy/lesson/variability-in-statistics-definition-measures-quiz.html

Answer:  a) 0,19 seg. b) 3,2 seg. c) 11,5 seg.  d) 192 seg.

Explanation:

a)  For each pixel in the image, we use 8 bits + 1 start bit + 1 stop bit= 10 bits.

b)  If the modem speed changes to 3 Mb/s, all we need to do is just use the same equality, as follows:

c) Now, if we need to transmit a colored image , at a rate of 20 f/sec, we need to calculate first how many bits we need to transmit, as follows:

d) Same as c) replacing 50 Mb/s by 3 Mb/s, as follows:

The time that's required to transmit an image of 1200x800 pixels with 8 bits for gray is 151.6 million seconds.

The time required to transmit an image of 1200x800 pixels with 8 bits for gray will be:

= (1200 × 800 × 8) / 50

= 151.6 million seconds.

The time needed to be at 3 M bits/sec, a representative of download speed of a DSL connection will be:

= 7.68/3

= 2.56 seconds.

Learn more about time on:

https://brainly.com/question/4931057

Answer:

The monolithic kernel is a bigger process that run in a unique memory address. All the kernel services run over the kernel space.

In micro kernel it get split in services in different memory spaces. Each one run in it own space.

Explanation:

Advantages:

    1. Monolithic:

    2. Micro:

Answer:

 The cyber criminals are the people that are engaged with getting the data in an unapproved way and furthermore mischief to the association henceforth are considered as cyber criminals.

Cyber criminals are people or groups of individuals who use innovation to committed the malicious exercises on computerized frameworks or systems with the aim of taking the organization data or individual information and producing benefit.

There are many types of cyber criminals that are:

Answer:

<!DOCTYPE html>

<html>

<body>

<h2>My Webpage</h2>

<script>

console.log("hello");

</script>

</body>

</html>  

Explanation:

The above written is the HTML code which contains a script tag in which javascript code is written to print hello on the javascript developer console.The script element contains the statement console.log("hello"); which is used to print the argument provided in the console.log on the console of the  javascript.

To see hello on the console you have open javascript console in the browser.Otherwise it will not be visible to you.

Answer:

//""Print results to screen""

Explanation:

In c,c++,java,javascript // is used for the single line comment.

syntax:- // comment.

Whatever text that is followed after // is commented means this line will not get executed by the compiler.

Comments are used to explain the code to other person who is working on the code or trying to understand that code.