Java Program to Calculate average using Array
Example 1: Program to find the average of numbers using array
public class JavaExample {
public static void main(String[] args) {
double[] arr = {19, 12.89, 16.5, 200, 13.7};
double total = 0;
for(int i=0; i<arr.length; i++){
total = total + arr[i];
}
/* arr.length returns the number of elements
* present in the array
*/
double average = total / arr.length;
/* This is used for displaying the formatted output
* if you give %.4f then the output would have 4 digits
* after decimal point.
*/
System.out.format("The average is: %.3f", average);
}
}
Output:
The average is: 52.418
Example 2: Calculate average of numbers entered by user
In this example, we are using Scanner to get the value of n and all the numbers from user.
import java.util.Scanner;
public class JavaExample {
public static void main(String[] args) {
System.out.println("How many numbers you want to enter?");
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
/* Declaring array of n elements, the value
* of n is provided by the user
*/
double[] arr = new double[n];
double total = 0;
for(int i=0; i<arr.length; i++){
System.out.print("Enter Element No."+(i+1)+": ");
arr[i] = scanner.nextDouble();
}
scanner.close();
for(int i=0; i<arr.length; i++){
total = total + arr[i];
}
double average = total / arr.length;
System.out.format("The average is: %.3f", average);
}
}
Output:
How many numbers you want to enter?
5
Enter Element No.1: 12.7
Enter Element No.2: 18.9
Enter Element No.3: 20
Enter Element No.4: 13.923
Enter Element No.5: 15.6
The average is: 16.225
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