Write the code above and the ones below in netbeans IDE 81 3

Write the code above and the ones below in netbeans IDE 8.1

3. (Eliminate duplicates) Write a method that returns a new array by eliminating the duplicate values in the array using the following method header: public static int[] eliminateDuplicates(int[] list) Write a test program that reads in ten integers, invokes the method, and displays the result. Here is the sample run of the program:

Enter ten numbers: 1 2 3 2 1 6 3 4 5 2 [Enter]

The distinct numbers are: 1 2 3 6 4 5

4. (Sort students) Write a program that prompts the user to enter the number of students, the students’ names, and their scores, and prints student names in decreasing order of their scores.

Solution

Please follow the code and comments for description :

a)

CODE :

import java.util.Scanner;

public class MeanSD {
  
    public static double deviation (double[] x) { // method to return the deviation
        double sum = 0, mean = 0, deviation = 0; // required initialisations
        double[] temp = new double[10]; // temporary array
        for (int i = 0; i < 10; i++) //calculate the standard deviation
        {
            temp[i] = Math.pow((x[i] - mean), 2); // assigning the value to the array
            sum += temp[i]; // adding up the values
        }
        mean = sum / 10; // getting the mean
        deviation = Math.sqrt(mean); // calculating the deviation      
        return deviation; // returning the deviation
    }
  
    public static double mean (double[] x) { // method to return themean of the values entered
        double sum = 0, mean; // required initialisations
        for (int i = 0; i < 10; i++) //Take input in the array
        {
            sum += x[i]; //sum of all elements
        }
        mean = sum / 10; // calculating the mean
        return mean; // returning the mean value
    }

    public static void main(String[] args) { // driver method
        System.out.println(\"Enter the 10 numbers.\"); // prompt to enter the data
        Scanner in = new Scanner(System.in); // scanner class to get the data from the user
        double[] arr = new double[10]; // array that saves the data
        double sum = 0, mean = 0, deviation = 0; // required initialisations
        for (int i = 0; i < 10; i++) //Take input in the array
        {
            System.out.print(\"Enter a number : \"); // prompt to enter the number
            arr[i] = in.nextDouble(); // getting the data from the console         
        }
        mean = mean(arr); // calling the method to return the mean value
        System.out.println(\"Mean : \" + mean); //Display mean of all elements
        deviation = deviation(arr); // calling the method to return teh deviation value
        System.out.println(\"Deviation : \" + deviation); // display the result
    }
}

OUPTPUT :

Enter the 10 numbers.
Enter a number : 1
Enter a number : 2
Enter a number : 3
Enter a number : 4
Enter a number : 5
Enter a number : 6
Enter a number : 7
Enter a number : 8
Enter a number : 9
Enter a number : 10
Mean : 5.5
Deviation : 6.2048368229954285

b)

CODE :

import java.util.Scanner;

public class MyDuplicateElements {

    public static int[] eliminateDuplicates(int[] input) { // method to remove the duplicates

        int j = 0; // required initialisations
        int i = 1;
        //return if the array length is less than 2
        if (input.length < 2) { // checking for the input data
            return input; // returning the data
        }
        while (i < input.length) { // iterating over the data int the list
            if (input[i] == input[j]) { // checking for the array data elements
                i++; // incrementing the index value
            } else {
                input[++j] = input[i++];
            }
        }
        int[] output = new int[j + 1]; // resultant array
        for (int k = 0; k < output.length; k++) { // iterating over the loop
            output[k] = input[k]; // assigning the data
        }

        return output; // returning the result
    }

    public static void main(String a[]) { // driver method
        Scanner in = new Scanner(System.in); // scanner class to get the data from the user
        int[] array = new int[10];
        System.out.println(\"Enter the Elements Please : \"); // prompt to enter the data
        for (int i = 0; i < 10; i++) //Take input in the array
        {
            System.out.print(\"Enter a number : \"); // prompt to enter the number
            array[i] = in.nextInt(); // getting the data from the console         
        }
        int[] output = eliminateDuplicates(array); // calling the method to return the duplicate free elements
        System.out.println(\"The Duplicate Free Array is : \");
        for (int i : output) {
            System.out.print(i + \" \");
        }
    }
}

OUPTPUT :

Enter the Elements Please :
Enter a number : 1
Enter a number : 2
Enter a number : 2
Enter a number : 6
Enter a number : 4
Enter a number : 3
Enter a number : 3
Enter a number : 4
Enter a number : 7
Enter a number : 8
The Duplicate Free Array is :
1 2 6 4 3 4 7 8

c)

CODE :

import java.util.*;

public class SortingtheStudents { // class to run the code

    public static void main(String[] args) { // driver class
        Scanner input = new Scanner(System.in); // scanner class to get the data
        System.out.print(\"Enter the total number of Students: \"); // prompt to enter the data
        int totalStudents = input.nextInt(); // getting the data
        String[] stNames = new String[totalStudents]; // array to save the data
        int[] scoreData = new int[totalStudents];
        for (int i = 0; i < totalStudents; i++) { // iterating over the loop
            System.out.print(\"Enter the Student\'s Name: \"); // student name enter
            stNames[i] = input.next();
            System.out.print(\"Enter the Student\'s Score: \"); // prompt to enter the score
            scoreData[i] = input.nextInt();
        }
        descendSort(stNames, scoreData); // calling the method
        System.out.println(\"The Order of the Students based on the Scores is : \");
        System.out.println(Arrays.toString(stNames)); // printing the result
    }

    public static void descendSort(String[] stNames, int[] scoreData) { // method to sort the data
        for (int i = scoreData.length - 1; i >= 1; i--) { // iterating over the loop
            String temp; // required initialisations
            int currentMax = scoreData[0];
            int currentMaxIndex = 0;
            for (int j = 1; j <= i; j++) { // iterating over the loop to get the data
                if (currentMax > scoreData[j]) { // checking the conditions
                    currentMax = scoreData[j];
                    currentMaxIndex = j; // assigning the values
                }
            }
            if (currentMaxIndex != i) {
                temp = stNames[currentMaxIndex];
                stNames[currentMaxIndex] = stNames[i];
                stNames[i] = temp;
                scoreData[currentMaxIndex] = scoreData[i];
                scoreData[i] = currentMax; // assigning the values
            }
        }
    }
}

OUPTPUT :

Enter the total number of Students: 3
Enter the Student\'s Name: John
Enter the Student\'s Score: 98
Enter the Student\'s Name: Carter
Enter the Student\'s Score: 58
Enter the Student\'s Name: MArk
Enter the Student\'s Score: 65
The Order of the Students based on the Scores is :
[John, MArk, Carter]

Hope this is helpful.