Q. In java, I would like to know, especially how the program detect there is an error which is user should put only numerical data but if user put letter data (five, sixty instead of 5,60), *I want the program display "Invalid data. Please try again" instead of long error message(from the IDE)* when user put letter data(five, sixty stuff...) and GO BACK TO THE BEGINNING SO USER CAN PUT THE DATA AGAIN!

Write a program that counts change. The program should ask for the number of quarters, the number of dimes, the number of nickels and the number of pennies. The program should then compute the value of all the coins and tell the user how much money there is, expressed in dollars. Display a title at the top of the screen when the program first runs. You must use constants for the value of each coin type. Multiply the number of each coin times the value for each coin (the defined constant). Refer to the PowerPoint or video on the use of the constants.

1) if quarters =100 dimes = 100 nickels = 100 pennies = 99

=>expected result = 40.99

2) if quarters = hundred dimes = hundred nickels = nine pennies = hundred

=> expected result ""Invalid data. Please try again" (GO BACK TO THE BEGINNING, SO USER CAN PUT THE DATA AGAIN!) <- this is the part i am struggling. Please Help!

1. Circle:

Implement a Java class with the name Circle. It should be in the package edu.gcccd.csis.

The class has two private instance variables: radius (of the type double) and color (of the type String).

The class also has a private static variable: numOfCircles (of the type long) which at all times will keep track of the number of Circle objects that were instantiated.

Construction:

A constructor that constructs a circle with the given color and sets the radius to a default value of 1.0.

A constructor that constructs a circle with the given, radius and color.

Once constructed, the value of the radius must be immutable (cannot be allowed to be modified)

Behaviors:

Accessor and Mutator aka Getter and Setter for the color attribute

Accessor for the radius.

getArea() and getCircumference() methods, hat return the area and circumference of this Circle in double.

Hint: use Math.PI (https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#PI (Links to an external site.))

2. Rectangle:

Implement a Java class with the name Rectangle. It should be in the package edu.gcccd.csis.

The class has two private instance variables: width and height (of the type double)

The class also has a private static variable: numOfRectangles (of the type long) which at all times will keep track of the number of Rectangle objects that were instantiated.

Construction:

A constructor that constructs a Rectangle with the given width and height.

A default constructor.

Behaviors:

Accessor and Mutator aka Getter and Setter for both member variables.

getArea() and getCircumference() methods, that return the area and circumference of this Rectangle in double.

a boolean method isSquare(), that returns true is this Rectangle is a square.

Hint: read the first 10 pages of Chapter 5 in your text.

3. Container

Implement a Java class with the name Container. It should be in the package edu.gcccd.csis.

The class has two private instance variables: rectangle of type Rectangle and circle of type Circle.

Construction:

No explicit constructors.

Behaviors:

Accessor and Mutator aka Getter and Setter for both member variables.

an integer method size(), that returns 0, if all member variables are null, 1 either of the two member variables contains a value other than null, and 2, if both, the rectangle and circle contain values other than null.

Problem 1:

More than 2500 years ago, mathematicians got interested in numbers.

Armstrong Numbers: The number 153 has the odd property that 13+53 + 33 = 1 + 125 + 27 = 153. Namely, 153 is equal to the sum of the cubes of its own digits.

Perfect Numbers: A number is said to be perfect if it is the sum of its own divisors (excluding itself). For example, 6 is perfect since 1, 2, and 3 divide evenly into 6 and 1+ 2 + 3 = 6.

Input File

The input is taken from a file named number.in and which a sequence of numbers, one per line, terminated by a line containing the number 0.

Output File

All the numbers read from the input file, are printed one per line followed by a sentence indicating whether the number is or is not Armstrong number and whether it is or is not a perfect number. Sample Input 153 6 0 Sample Output 153 is an Armstrong number but it is not a perfect number. 6 is not an Armstrong number but it is a perfect number.

Note: the program must be write in java

Identify the major steps involved in the data file update process

Using C++. Write a program to input marks of five subjects Physics, Chemistry, Biology, Mathematics and Computer. The input marks must be inserted one subject at a time. The program then calculate percentage and grade according to given conditions:

If percentage >= 90% : Grade A

If percentage >= 80% : Grade B

If percentage >= 70% : Grade C

If percentage >= 60% : Grade D

If percentage >= 40% : Grade E

If percentage < 40% : Grade F

Example1: Please input marks of five subjects.

Physics: 95

Chemistry: 95

Biology: 97

Mathematics: 98

Computer: 90

Percentage = 95.00

Grade A

Example2: Please input marks of five subjects.

Physics: 85

Chemistry: 80

Biology: 95

Mathematics: 98

Computer: 70

Percentage = 85.60

Grade B

Arrange the following binary tree types in increasing order of height with the worst-case height of each type.

Binary Tree

Full Binary Tree

Complete Binary Tree

Binary Search Tree

Balanced Binary Tree

Create a dynamic array-based Queue ADT class in C++ that contains enqueue(Inserts newElement at the back ) and dequeue(Removes the frontmost element ). If the size of the array is equal to the capacity a new array of twice the capacity must be made.

The interface is shown:

class Queue {
    private:
        int* elements;  
        unsigned elementCount;  // number of elements in the queue
        unsigned capacity;      // number of cells in the array
        unsigned frontindex;    // index the topmost element
        unsigned backindex;     // index where the next element will be placed

    public:
        // Description: Constructor
        Queue();


        // Description: Inserts newElement at the back (O(1))
        void enqueue(int newElement);

 
        // Description: Removes the frontmost element (O(1))
        // Precondition: Queue not empty
        void dequeue();


        // Description: Returns a copy of the frontmost element (O(1))
        // Precondition: Queue not empty
        int peek() const;


        // Description: Returns true if and only if queue empty (O(1))
        bool isEmpty() const;
};

Thanks!

Powerball. In this assignment you are to code a program that selects 20 random non-repeating positive numbers (the Powerball Lottery numbers), inputs three numbers from the user and checks the input with the twenty lottery numbers. The lottery numbers range from 1 to 100. The user wins if at least one input number matches the lottery numbers.

As you program your project, demonstrate to the lab instructor displaying an array passed to a function. Create a project titled Lab6_Powerball. Declare an array wins of 20 integer elements.

Define the following functions:

• Define function assign() that takes array wins[] as a parameter and assigns 0 to each element of the array.

  Hint: Array elements are assigned 0, which is outside of lottery numbers' range, to distinguish elements that have not been given lottery numbers yet.

  Passing an array as a parameter and its initialization is done similar to the code in this program.

  • #include <iostream>
    using std::cout; using std::endl; using std::cin;
    
    // initializes the array by user input
    void fillUp(int [], int);
    
    int main( ) {
       const int arraySize=5;
       int a[arraySize];
    
       fillUp(a, arraySize);
    
       cout << "Echoing array:\n";
       for (int i = 0; i < arraySize; ++i)
          cout << a[i] << endl;
    }
    
    // fills upt the array "a" of "size"
    void fillUp(int b[], int size) {
    
       cout << "Enter " << size << " numbers: ";
       for (int i = 0; i < size; ++i)
          cin >> b[i];
    }

• Define a predicate function check() that takes a number and the array wins[] as parameters and returns true if the number matches one of the elements in the array, or false if none of the elements do. That is, in the function, you should write the code that iterates over the array looking for the number passed as the parameter. You may assume that the number that check() is looking for is always positive.

  Hint: Looking for the match is similar to looking for the minimum number in this program.

  • #include <iostream>
    using std::cout; using std::endl; using std::cin;
    
    int main(){
    
       const int arraySize=5;
       int numbers[arraySize];  // array of numbers
    
       // entering the numbers
       cout << "Enter the numbers: ";
       for(int i=0; i < arraySize; ++i)
            cin >> numbers[i];
    
      // finding the minimum
      int minimum=numbers[0]; // assume minimum to be the first element
      for (int i=1; i < arraySize; ++i) // start evaluating from second
            if (minimum > numbers[i]) 
               minimum=numbers[i];
      
      cout << "The smallest number is: " << minimum << endl;
    
    }
    

• Define a function draw() that takes array wins as a parameter and fills it with 20 random integers whose values are from 1 to 100. The numbers should not repeat.

  Hint: Use srand(), rand() and time() functions that we studied earlier to generate appropriate random numbers from 1 to 100 and fill the array. Before the selected number is entered into the array wins, call function check() to make sure that the new number is not already in the array. If it is already there, select another number.

  The pseudocode for your draw() function may be as follows:

      declare a variable "number of selected lottery numbers so far",
                   initialize this variable to zero
      while (the_number_of_selected_elements is less than the array size)
           select a new random number
           call check() to see if this new random number is already in the array
           if the new random number is not in the array
               increment the number of selected elements
               add the newly selected element to the array
  
     

• Define function entry() that asks the user to enter a single number from 1 to 100 and returns this value.
• Define function printOut() that outputs the selected numbers and user input.
  Hint: Outputting the array can be done similar to echoing it in this program.

  • #include <iostream>
    using std::cout; using std::endl; using std::cin;
    
    // initializes the array by user input
    void fillUp(int [], int);
    
    int main( ) {
       const int arraySize=5;
       int a[arraySize];
    
       fillUp(a, arraySize);
    
       cout << "Echoing array:\n";
       for (int i = 0; i < arraySize; ++i)
          cout << a[i] << endl;
    }
    
    // fills upt the array "a" of "size"
    void fillUp(int b[], int size) {
    
       cout << "Enter " << size << " numbers: ";
       for (int i = 0; i < size; ++i)
          cin >> b[i];
    }
    

The pseudocode your function main() should be as follows:

  main(){
      declare array and other variables
  
      assign(...) // fill array with 0
      draw(...)       // select 20 non-repeating random numbers
      iterate three times
            entry(...)      // get user input
            use check () to compare user input against lottery numbers
            if won state and quit
      printOut(...)   // outputs selected lottery numbers
  }
  

Note: A program that processes each element of the array separately (i.e. accesses all 20 elements of the array for assignment or comparison outside a loop) is inefficient and will result in a poor grade.

Note 2: For your project, you should either pass the array size (20) to the functions as a parameter or use a global constant to store it. Hard-coding the literal constant 20 in function definitions that receive the array as a parameter is poor style. It should be avoided.

Why is security so important to wireless networks? Give two examples of defense measures that should be taken to enhance wireless security.

Write a class called CombineTwoArraysAlternating that combines two
  lists by alternatingly taking elements, e.g.

     [a,b,c], [1,2,3] -> [a,1,b,2,c,3].
  
  You must read the elements of the array from user input by reading
  them in a single line, separated by spaces, as shown in the examples
  below.

  Despite the name of the class you don't need to implement this class
  using arrays.  If you find any other way of doing it, as long as it
  passes the test it is ok.

  HINTS:

  You don't need to use any of my hints.  As long as you pass the test
  you can write the code any way you want.

  I used:

        String [] aa = line.split("\\s+");        

  to split the String contained in the variable called 'line' into
  strings separated by at least one white space character.  For
  example if line is "hello world how are you?" the previous statement
  populates array aa in such a way that

     aa[0] is: "hello" 
     aa[1] is: "world" 
     aa[2] is: "how"
     aa[3] is: "are" 
     aa[4] is: "you?"

  I used the method Arrays.toString from java.util.Arrays to print
  arrays.  For example the following lines of code:

        String line = "hello world how are you?";
        String [] aa = line.split("\\s+");
        //Arrays.toString(aa) takes array aa and returns a nicely formatted String
        System.out.println(Arrays.toString(aa));

  produce the following output:

        [hello, world, how, are, you?]
        

For Cloud Database Encryption Technology Based on Combinatorial Encryption

You are required to research and report on this topic according to the Detail of Question below.

A. understand in order to present three main parts:

1. Summary:

o Provide a 200-300 word summary of the paper under review, from the background to the results being presented, and further work proposed. Please do NOT copy the abstract into this space!

2. Main points:

o The main issues as you see them.

o This is different than the summary.

3. Strengths and Weaknesses:

o Provide some critical analysis of the paper under review, positive and/or negative.

What do you understand by pre- and post-conditions of a function?
Write the pre- and post-conditions to axiomatically specify the following
functions:
(a) A function takes two floating point numbers representing the sides of
a rectangle as input and returns the area of the corresponding
rectangle as output.
(b) A function accepts three integers in the range of -100 and +100 and
determines the largest of the three integers.
(c) A function takes an array of integers as input and finds the minimum
value.
(d) A function named square-array creates a 10 element array where
each all elements of the array, the value of any array element is
square of its index.
(e) A function sort takes an integer array as its argument and sorts the
input array in ascending order.

Suppose you turn on a system and everything is dead- no lights, nothing on the monitor screen, and no spinning fan or hard drive. You verify the power to the system works, all power connections and power cords are securely connected, and all pertinent switches are turned on. you are now sure the power supply has gone bad. Explain in 2 to 3 paragraph how you will go about to buy and install a new power supply and making sure the problem is resolved.

Create and display an XML file in Android studio that has

-One edittext box the does NOT use material design

-One edittext box that DOES use material design

Provide a “hint” for each, and make sure the string that comprises the hint is referenced from the strings.xml file.

Observe the differences in how the hints are displayed.

Here is sample code for a material design editText:

<android.support.design.widget.TextInputLayout
        android:id="@+id/input_layout_price1Text"
        android:layout_width="80dp"
        android:layout_height="40dp"            >

    <EditText
            android:id="@+id/price1Text"
            android:importantForAutofill="no"
            tools:targetApi="o"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="6"
            android:inputType="numberDecimal"
            android:hint="@string/hint_text" />
</android.support.design.widget.TextInputLayout>

It requires this to be added to the build.gradle Module:app

implementation 'com.android.support:design:28.0.0'

Take a screenshot, Make sure the screenshot clearly shows the two different ways that the hints are displayed.