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Java Program to Calculate the Sum and the Average of N Numbers

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Average of n numbers

Java programs to calculate the sum and the average of N numbers have been shown here. The result can be obtained using an array or without an array. For example, if a set of given numbers is {10, 20, 30, 40, 50, 60}, the sum and average of these numbers are 210 and 35, respectively.






1. Algorithm to find the sum and average of N numbers


1. Take number of terms $n$ as inputs.

2. Set $s = 0$ and $i = 0$

3. Take a number $x$ as input.

4. Perform $s = s + x$ and $i = i + 1$

5. Check if $i < n$, then go to step 3, else go to step 6

6. Display $s$ as the sum and $\frac{s}{n}$ as the average and exit program.




2. Pseudocode to find the sum and average of N numbers


Input: Number of terms $n$

Output: Sum and average of those $n$ terms

1. Procedure sumAverage($n$):

2. $sum \leftarrow 0$

3. $i \leftarrow 0$

4. Repeat for each $i < n$:

5. Read a number $x$

6. $sum \leftarrow sum + x$

7. $i \leftarrow i + 1$

8. $avg \leftarrow \frac{sum}{n}$

9. Return $sum$, $avg$

10. End Procedure





3. Time complexity to find the sum and average of N numbers


Time Complexity: O(n)

Here $n$ is the number of terms.





4. Java Program & output to calculate sum & average of n numbers without an array

Code has been copied
/**************************************************************
	             alphabetacoder.com
Java program to calculate the Sum and the Average of N numbers
***************************************************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int i, n, num, sum = 0;
        float avg;

        // take input
        System.out.print("Enter the no. of elements: ");
        n = sc.nextInt();

        // take input of numbers one by one
        // add each number to sum
        System.out.print("Enter " + n + " elements: \n");
        for (i = 1; i <= n; i++) {
            num = sc.nextInt();
            sum = sum + num;
        }

        // calculate average
        avg = (float) sum / n;

        // display result
        System.out.println("Sum: " + sum);
        System.out.println("Average: " + avg);
    }
}

Output

Enter the no. of elements: 7

Enter 7 elements:

8 4 9 3 2 10 5

Sum: 41

Average: 5.857143





5. Java Program to calculate sum & average of n numbers using an array

Code has been copied
/****************************************
	    alphabetacoder.com
Java program to calculate the Sum and 
the Average of N numbers using an array
*****************************************/

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        // declare instance of Scanner class
        Scanner sc = new Scanner(System.in);
        // declare variables
        int i, n, sum = 0;
        int[] N = new int[20];
        float avg;

        // take input
        System.out.print("Enter the no. of elements: ");
        n = sc.nextInt();

        // take input of numbers one by one
        // store the numbers in array N[]
        System.out.print("Enter " + n + " elements: \n");
        for (i = 0; i < n; i++) {
            N[i] = sc.nextInt();
        }

        // calculate the sum of array elements
        for (i = 0; i < n; i++) {
            sum = sum + N[i];
        }

        // calculate average
        avg = (float) sum / n;

        // display result
        System.out.println("Sum: " + sum);
        System.out.println("Average: " + avg);
    }
}

Output

Enter the no. of elements: 5

Enter 5 elements:

10 20 30 22 27

Sum: 109

Average: 21.8





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