Java Program to calculate average of an Array

Karmehavannan

7 years ago

Java Program to calculate the average of an Array

In this tutorial, we discuss a simple concept of Java Program to calculate the average of an Array

In this topic, we can learn how to calculate the average of n number of elements (integer or floating point)using the array in Java programming language.

Average calculated using the operator in Java programming language

Java Program to find average of an Array — Calculate average

find the average of integer values

Program 1

In this program, we can see step by step procedure for completion of the program.

array declaration and initialization
essential variable declaration
loop for calculating total through each value
Calculating average
Display result on the screen

Calculate the average of numbers using an array

class Array_Avg{
public static void main (String args[]){
int[] arr={45,67,89,76,54,49,98,80};//declared and initialized an array
int total=0;//declared and initialized total value
for(int i=0; i<=arr.length-1; i++){//i<=arr.length-1 equalto i<arr.length
total=total + arr[i];
}
//arr.length provide the number of array element for calculate total

double avg=total/arr.length;
// calculate average of array elements 

System.out.println("The average of numbers are: "+avg);
}
}

When the above code is compiled and executed, it produces the following results

The average of numbers are: 69.0

Program 2

In this program, we can see step by step procedure for completion of the program.

Array declaration
essential variable declaration
loop for taking input from the user for every index
loop for calculating total through each value
Calculating average
Display result on the screen

Calculate the average of numbers using an array – entered by the user

import java.util.Scanner;
class Array_Avg1{
public static void main (String args[]){
System.out.println("How many number you want to calculate average: ");
Scanner scan=new Scanner(System.in);
int n=scan.nextInt();
int[] arr=new int[n];//declaring an array of n elements
int total=0;//declared and initialized total value as zero

//fist for loop for get input from user
for(int i=0; i<=arr.length-1; i++){//i<=arr.length-1 equalto i<arr.length
System.out.print("Enter the numbers "+(i+1)+": ");//n elements
arr[i]=scan.nextInt();
}

for(int i=0; i<=arr.length-1; i++){//i<=arr.length-1 equalto i<arr.length
total=total + arr[i];
}
//arr.length provide the number of array element for calculate total

double avg=total/arr.length;
// calculate average of array elements 

System.out.println("\nThe average of numbers are: "+avg);
}//display result on the screen
}

When the above code is compiled and executed, it produces the following results

How many numbers you want to calculate average:
6
Enter the number 1: 56
Enter the number 1: 79
Enter the number 1: 98
Enter the number 1: 80
Enter the number 1: 83
Enter the number 1: 76

The Average of numbers are: 78.0

find the average of floating point values

Program 3

In this program, we can see what should be step by step procedure for completion of the program.

array declaration and initialization
essential variable declaration
loop for calculating total through each value
Calculating average
Display result on the screen

Calculate the average of numbers using an array

class Array_Avg2{
public static void main (String args[]){
double[] arr={68.56,35.90,69.76,60.12,43.54,40.34,80.3};//declared and initialized an array
double total=0;//declared and initialized total value
for(int i=0; i<=arr.length-1; i++){//i<=arr.length-1 equalto i<arr.length
total=total + arr[i];
}
//arr.length provide the number of array element for calculate total

double avg=total/arr.length;
// calculate average of array elements 

System.out.format("\nThe average is %.3f",avg);
}//display the average on the screen
}

When the above code is compiled and executed, it produces the following results

The average is 56.931

Program 4

In this program, we can see what should be step by step procedure for completion of the program.

Array declaration
Essential variable declaration
loop for taking input from the user for every index
loop for calculating total through each value
Calculating average
Display result on the screen

Calculate the average of numbers using an array – entered by the user

import java.util.Scanner;
class Array_Avg3{
public static void main (String args[]){
System.out.println("How many number you want to calculate average: ");
Scanner scan=new Scanner(System.in);
int n=scan.nextInt();
double[] arr=new double[n];//declaring an array of n elements
double total=0;//declared and initialized total value as zero

//fist for loop for get input from user
for(int i=0; i<=arr.length-1; i++){//i<=arr.length-1 equalto i<arr.length
System.out.print("Enter the numbers "+(i+1)+" :");//n elements
arr[i]=scan.nextDouble();
}
scan.close();
for(int i=0; i<=arr.length-1; i++){//i<=arr.length-1 equalto i<arr.length
total=total + arr[i];
}
//arr.length provide the number of array element for calculate total

double avg=total/arr.length;
// calculate average of array elements 

System.out.format("\nThe average is %.3f",avg);
}//display the average on the screen
}

When the above code is compiled and executed, it produces the following results

How many numbers you want to calculate average: 
5 
Enter the number 1: 45.8 
Enter the number 1: 56.98 
Enter the number 1: 76.43 
Enter the number 1: 87.24 
Enter the number 1: 57.43 

The Average of numbers are: 64.776

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