# Average of n Numbers in Java

In this post, we’ll see various ways of calculating average of n numbers in Java.
1) Average of 3 input numbers
2) Average of n numbers input by user
3) Average of the numbers in an array

## Average of 3 input numbers:

``````package com.techstackjournal.average;

import java.util.InputMismatchException;
import java.util.Scanner;

public class AverageOfNumbersExample1 {

public static void main(String[] args) {
int counter = 1, num, sum = 0, avg;
Scanner scanner = new Scanner(System.in);

while (counter <= 3) {
System.out.println("Enter num " + counter + " : ");
try {
num = scanner.nextInt();
} catch (InputMismatchException ex) {
scanner.nextLine();
System.out.println("Enter a valid number");
continue;
}
scanner.nextLine();
sum += num;
counter++;
}

scanner.close();
avg = sum / (counter - 1);
System.out.println("Average of 3 numbers is: " + avg);

}

}``````

We are calling nextLine to read the newline character entered after the number. If we do not do this, next time when nextInt is called it may not found the number.

``````Enter num 1 :
2
Enter num 2 :
r
Enter a valid number
Enter num 2 :
4
Enter num 3 :
6
Average of 3 numbers is: 4``````

## Average of n numbers input by user:

``````package com.techstackjournal.average;

import java.util.Scanner;

public class AverageOfNumbersExample2 {

public static void main(String[] args) {
int counter = 1, num, sum = 0, avg;
String tempStr;
Scanner scanner = new Scanner(System.in);

while (true) {
System.out.println("Enter num " + counter + " : ");
tempStr = scanner.nextLine();
if (tempStr.equalsIgnoreCase("Q")) {
break;
}

try {
num = Integer.parseInt(tempStr);
} catch (NumberFormatException ex) {
System.out.println("Enter a valid number");
continue;
}
sum += num;
counter++;
}

scanner.close();
avg = sum / (counter - 1);
System.out.println("Average of " + (counter - 1) + " numbers is: " + avg);

}

}``````
``````Enter num 1 :
5
Enter num 2 :
f
Enter a valid number
Enter num 2 :
5
Enter num 3 :
5
Enter num 4 :
q
Average of 3 numbers is: 5``````

## Average of the numbers in an array:

``````package com.techstackjournal.average;

public class AverageOfNumbersExample3 {

public static void main(String[] args) {

int[] nums = { 2, 4, 6, 8, 10 };
int sum = 0, avg;

for (int n : nums) {
sum += n;
}

avg = sum / nums.length;
System.out.println("Average of " + nums.length + " numbers is: " + avg);

}

}``````
``Average of 5 numbers is: 6``