Question

Write a C++ program that will create an array with a given number of elements. Use size = 10 for demonstration purposes, but write the program where the size of the array can be changed by changing the value of one constant. Fill the array with random numbers between 0 and 100. Write the program to perform the following operations: 1. Find and display the largest value in the array. 2. Find and display the smallest value in the array. 3. Sort the array in descending order and display the array. 4. Find and display the mean value. 5. Find and display the median value. 6. Find and display the variance. Write the program to make each operation a separate function

Answer 1

1. include<iostream>

2. using namespace std;

3. int main ()

4. {

5.     int arr[10], n, i, max, min;

6.     cout << "Enter the size of the array : ";

7.     cin >> n;

8.     cout << "Enter the elements of the array : ";

9.     for (i = 0; i < n; i++)

10.         cin >> arr[i];

11.     max = arr[0];

12.     for (i = 0; i < n; i++)

13.     {

14.         if (max < arr[i])

15.             max = arr[i];

16.     }

17.     min = arr[0];

18.     for (i = 0; i < n; i++)

19.     {

20.         if (min > arr[i])

21.             min = arr[i];

22.     }

23.   

    for(i=0;i<n;i++)
            {               
                    for(j=i+1;j<n;j++)
                    {
                            if(arr[i]<arr[j])
                            {
                                    temp  =arr[i];
                                    arr[i]=arr[j];
                                    arr[j]=temp;
                            }
                    }
            }
            
            //print sorted array elements
            cout<<"Sorted (Descending Order) Array elements:"<<endl;
            for(i=0;i<n;i++)
                    cout<<arr[i]<<"\t";
            cout<<endl;       

24.     cout << "Largest element : " << max;

25.     cout << "Smallest element : " << min;

26.     return 0;

27. }

For standard deviation,mean and median , I am writing separatle as it will be difficult to trac everything in one program

1)Standard devaition

1. #include <iostream>
2. #include <cmath>
3. using namespace std;
4. float calculateSD(float data[]);
5. int main()
6. {
7. int i;
8. float data[10];
9. cout << "Enter 10 elements: ";
10. for(i = 0; i < 10; ++i)
11. cin >> data[i];
12. cout << endl << "Standard Deviation = " << calculateSD(data);
13. return 0;
14. }
15. float calculateSD(float data[])
16. {
17. float sum = 0.0, mean, standardDeviation = 0.0;
18. int i;
19. for(i = 0; i < 10; ++i)
20. {
21. sum += data[i];
22. }
23. mean = sum/10;
24. for(i = 0; i < 10; ++i)
25. standardDeviation += pow(data[i] - mean, 2);
26. return sqrt(standardDeviation / 10);
27. }

2)Mean and Meridian:

#include <bits/stdc++.h>

using namespace std;

  

// Function for calculating mean

double findMean(int a[], int n)

{

    int sum = 0;

    for (int i = 0; i < n; i++)

        sum += a[i];

      

    return (double)sum/(double)n;

}

  

// Function for calculating median

double findMedian(int a[], int n)

{

    // First we sort the array

    sort(a, a+n);

  

    // check for even case

    if (n % 2 != 0)

       return (double)a[n/2];

      

    return (double)(a[(n-1)/2] + a[n/2])/2.0;

}

  

// Driver program

int main()

{

    int a[] = { 1, 3, 4, 2, 7, 5, 8, 6 };

    int n = sizeof(a)/sizeof(a[0]);

    cout << "Mean = " << findMean(a, n) << endl;

    cout << "Median = " << findMedian(a, n) << endl;

    return 0;

}