Java Program to calculate average of an Array

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

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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