How many ways are there to arrange the letters a, b, c, d, e, and f such that a is not directly followed by either b or c? For example, “abdef c” and “acdef b” are both invalid, but “adbcef” is valid.

>>>>>C#<<<<<

A.     Number Frequency-Arrays

1. Write a program to count the number of 10’s in the given list of 15 numbers. The output should look like:                                                                                                        [01]
2. Extend your program to work with a list of n numbers.                                         [01]

          Random Numbers-Methods

1. Write a program to generate a 10 Random Numbers:                                           [01]
2. Extend your program to generate n Random numbers.                                         [01]

B.    Word Count -String Processing

1. Write a program to count the occurrence of word “an” in the string.               [01]
2. Extend your program to count the occurrence of string being input in the string.

               [01]

C.      Recursion

          By using recursion, write a program to:

1. Print digits in a number.                                                                                                                [01]
2. Find sum of digits of a number.                                                                                                  [01]

D.        Matrix Manipulation

Write a C# program to Perform Matrix Multiplication.                                                                      [02]

Note:-

The matrix multiplication can be performed only if:

• The number of columns of the first matrix is equal to
• The number of rows of the second matrix

Explain when and how the following are constructed and used. software engineering
a. Data Flow Diagrams
b. Activity Diagrams

The Strings Object in particular is full of useful classes and methods. You can parse and manipulate strings using several methods of the String class. These methods enable you to count characters, find and extract characters and substrings, replace characters and substrings, combine characters and substrings, and compare strings.

Questions to answer:

1. Identify three such methods and discuss how they are used. Then use them in simple relevant examples

2. As you research the String class, what are some of the most popular uses of substring searching in use today?
3. Are there any uses of strings not covered by the String class or mentioned in the prompt?
4. Are there other classes that inherit from the String class?
5. How does the String class extend or support the Array class?

Answer as soon as possible

Given a number, find the sum of all the unique multiples of particular
   numbers up to but not including that number.

If we list all the natural numbers below 20 that are multiples of 3 or 5, we
get 3, 5, 6, 9, 10, 12, 15, and 18.
  
   The sum of these multiples is 78.

Given Code:

public int getSumOfMultiples(int i, int[] set) {
       // Solution
       return 0;
   }
  

Write a program in C that reads prompts the user for a positive integer and then prints out that number in base 16, base 8 and base 2.

[Computer Science Question]

Compare and Contrast the trade-offs associated with using C++ in comparison to Python. How do the characteristics of the languages impact the amount of memory each language occupies. How do memory considerations impact each languages real world implementations?

In this assignment you must submit TWO different programs both of which accomplish the same thing but in two different ways.

Using NetBeans, create a program that prompts the user for a sentence. Then the program displays the position of where the lowercase letter 'a' appears everywhere in the sentence. Here is a sample of the input and output:

Enter a sentence
for the night is dark and full of terrors.
The lowercase letter 'a' appears at character position 18
The lowercase letter 'a' appears at character position 22

Write TWO different programs that accomplishes the above using different techniques. Take a look at the JavaDocs for the String methods available to you. For example, one way is you might use the 'charAt()' method while your second program uses 'indexOf()'.

please send me the solution in java as soon as possible.

what is the time complexity of those ?

//TODO - Question 18
   public static int[][] fillRandomArray4(int n) {
       int[][] arr = new int[n][n];
       for(int i = 0; i < arr.length; i++) {
           arr[i] = new int[] {(int)(Math.random() * 101),
                   (int)(Math.random() * 101),
                   (int)(Math.random() * 101)};
       }
       return arr;
   }
  
  
   //TODO - Question 19
   public static int factorial(int n) {
       if(n == 1 || n == 0) {
           return 1;
       }
       return n * factorial(n-1);
   }
  
  
   //TODO - Question 20 - assume str.length() == n
   public static boolean isPalindrome(String str) {
       if(str.length() == 0 || str.length() == 1) {
           return true;
       }
       if(str.charAt(0) != str.charAt(str.length()-1)) {
           return false;
       } else {
           return isPalindrome(str.substring(1,str.length()-1));
       }
   }

Given the following inheritance Diagram structure: Fruit: Apple and Orange, Apple: GoldenDelicious and MacIntosh Create a C++ Program that simulate the inheritance structure above. Fruit class should have at least two attributes name and color, getters and setters in addition to a method display() just to display the fruit details. Define the classes Apple, Orange, GoldenDelicious and MacIntosh All of which you can choose the attributes, constructors and methods of your choice, but all should have a redefinition of the method display() In the main create different objects of different classes, assign names and colors and demonstrate the dynamic binding call of the method display using (Polymorphism) GoldenDelicious MacIntosh Fruit Apple Orange

Execute SQL queries to get the countries in which the population has fallen from one year to the next, and the years in which it has occurred. Dump the output in the following format:

| country | year |  population | year | population |

| 1 | 2005 | 82500849 | 2006 | 82437995 |

| 1   | 2006 | 82437995 | 2007 |   82314906 |

(...)

And so on.

These are the SQL files:

Tables: pastebin.com/xw0j1NAM

Data: pastebin.com/hnpFT3QR

1. Exercise 12.4: Use a browser's developer tools to view the DOM tree of the document in Fig. 12.4. Look at the document tree of your favorite website. Explore the information these tools give you in the right panel(s) about an element when you click it.
   
   Please use the Chrome browser:

   1. Start with the documentation for Chrome Developer Tools: https://developers.google.com/web/tools/chrome-devtools/ (Links to an external site.)Links to an external site.
   2. CodeSchool has a free course on Chrome DevTools at https://www.codeschool.com/courses/discover-devtools (Links to an external site.)Links to an external site.

Write a paragraph or two about what you learned about using the Chrome developer tools.

2. Implement a web page that performs tip calculations. At a minimum, you will need an input element each for the original cost and for the tip rate, a button to trigger calculations, and an element for displaying the result. Use the DOM to access the elements in the web page. Do not use the prompt, alert, or document.writeln methods.

C++ You should have one main function + 4 other functions for your submission for this lab. you have no need for extra functions beyond that, and you should not have less. You may use any pre existing functions already defined in class or a previous lab.

-Write a function storeTotal(,) that takes two arguments of type double, and has a return type of type Boolean. This function will take the number 256 and divide it by the second parameter, and add the result to the first parameter. It will return true afterwards.

-You should be making mindful decisions of which parameters should be call by value and which should be call by reference.

-If dividing by the second parameter would result in a run time error, the program does not do the calculation, and instead returns false.

-Ask the user to input two numbers, one at a time, discarding excess input each time.

-The program should keep looping until the user enters valid input.

-Once the user enters input, call function storeTotal appropriately.

-Whether storeTotal runs successfully (returns true) or not (returns false), display an appropriate message.

-Output the results of the variable that is cumulating value. This number is ALWAYS displayed in scientific notation, accurate to 3 decimal places

Repeat this 2 times.

Sample Output

How much do you already have? A

Invalid Input!

How much do you already have? Bck

Invalid Input!

How much do you already have? 42.4

What is the split factor? ,!

Invalid Input!

What is the split factor? 3.5

You now have 1.155e+002

How much do you already have? 35.6

What is the split factor? 0

That didn't go well, you still have 3.560e+001

*Explanation* 256/3.5 and then added to 42.4 gives 115.54, which, in scientific notation, gives the output above.

*Note* How scientific notation is displayed can vary from compiler to compiler, as long as you are getting it done through proper knowledge of C++ then the output does not need to look exactly the same.

/*instructions: please do not change the general structure of the code that I already have

please write it in C programming

Define the interface for a queue ADT and implement it in two ways: one with a dummy node (or nodes) and one without.
In addition to the two standard queue functions you’ll need a function to create/initialize an empty queue,
a function to free an existing queue (which may not be empty),
and a function to return the size (number of keys) in the queue.
All functions should be as efficient as possible, e.g., the complexity of enqueue and dequeue must be O(1).
An additional requirement is that the underlying data structure should not be a doubly-linked list.*/

#include <stdio.h>
#include <stdlib.h>

typedef struct node{
int num;
struct node *next;
}Node;

typedef struct{
Node* front
Node* rear;
int size;
}Queue;

//Define the interface for a queue ADT
Queque* initializeQueque()
{
  
}

Queque* insert(int item)
{
  
}

Queque* delete()
{
  
}

void printList(Node* Q)
{
  
}

//get the size of the queque at postion [-1]
//return the size (number of keys) in the queue.
int getsize(Node* Q)
{
  
}

int main()
{
int option,item;
Node* Queque;
  
while(1){
printf("1.Insert number to queque\n2.Delete number from queque\n3.Display numbers in queque\n4.Exit\nEnter a option:");
scanf("%d",&option);
  
switch(option){
case 1:
printf("Enter the number:");
scanf("%d",&item);
Queque=insert(item);
break;
case 2:
Queque=delete();
break;
case 3:
printList(Queque);
break;
case 4:
return 1;
default:
printf("\nWrong input!\n");
break;
}
}
}