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Operators & Expressions

Java Program: Compute Average of Numbers using Dynamic Input

import java.util.Scanner;
 
class AverageCalculator {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter the number of elements: ");
        int n = sc.nextInt();  // Total numbers to input
 
        double sum = 0;
        for (int i = 1; i <= n; i++) {
            System.out.print("Enter number " + i + ": ");
            double num = sc.nextDouble();  // Dynamic input
            sum += num;
        }
 
        double average = sum / n;  // Average formula
        System.out.printf("Average of %d numbers = %.2f%n", n, average);
 
        sc.close();
    }
}

OUTPUT 1:

INPUT :
Enter the number of elements: 5
Enter number 1: 10
Enter number 2: 20
Enter number 3: 30
Enter number 4: 40
Enter number 5: 50

OUTPUT :
Average of 5 numbers = 30.00
 
OUTPUT 2:

INPUT :
Enter the number of elements: 3
Enter number 1: 7
Enter number 2: 8
Enter number 3: 10

OUTPUT :
Average of 3 numbers = 8.33

✅ Explanation

1. Import Scanner

import java.util.Scanner;

• Enables reading user input from the console.

2. Read Number of Elements

int n = sc.nextInt();

• User specifies how many numbers they want to enter.
• Allows dynamic input, not fixed number of values.

3. Loop for Input and Sum

for (int i = 1; i <= n; i++) {

    double num = sc.nextDouble();

    sum += num;

}

• Loops from 1 to n.
• Reads each number and adds it to sum.

4. Calculate Average

double average = sum / n;

• Formula:

Average=Sum of numbersTotal numbers\text{Average} = \frac{\text{Sum of numbers}}{\text{Total numbers}}Average=Total numbersSum of numbers

5. Display Output with Formatting

System.out.printf("Average of %d numbers = %.2f%n", n, average);

• Displays the average up to 2 decimal places.

6. Close Scanner

sc.close();

• Frees system resources.