Java Program to find the average of array Elements

Get array size n and n elements of array, then compute average of the elements.

Sample Input 1:

5 5 7 9 3 1

Sample Output 1:

25 5.0

Flow Chart Design

Try your Solution

Strongly recommended to Solve it on your own, Don't directly go to the solution given below.

Program or Solution

				
			
					
import java.util.*;
class SAvArray
{
  public static void main(String args[])
  {
     int size,i,sum=0;
     double avg;     
     Scanner sc=new Scanner(System.in);
     System.out.println("Enter Size Of Array:");
     size=sc.nextInt();
     int a[]=new int[size];
     System.out.println("Enter The Array Elements:\n");
     for(i=0;i<size;i++)
        {
            a[i]=sc.nextInt();
	    sum=sum+a[i];
	}
     System.out.println("The Sum Of Array Elements Is:\n"+sum);
     avg=sum/size;
     System.out.println("The Average Is:"+avg);
     

  }
}
			
				
			

Program Explanation

Array is a Collection of data with same type.

1. Get the size of the Array

2. Create a array with the given size (Array has 0 to size-1 index to access every location)

        0                     1                        2                       3                  ...........             size-2                  size-1

for(i=0;i<size;i++)

Here i starts at 0, incremented by 1 at every iteration and finally iteration stops when i is equal to size.

Therefore,

In First iteration i is 0, so a[i] is a[0]

In second iteration i is 1, so a[i] is a[1]

....

In last iteration i is size-1, so a[i] is a[size-1]

the input statement nextInt() reads input and stores in array location consecutively. like a[0], a[1], a[2].....

The second For Loop

sums the values of array consecutively like 

sum = sum + a[i]

sum = sum + a[0] in first iteration

sum = sum + a[1] in second iteration

......

sum = sum + a[size-1] in last iteration

Finally divide sum by size to find the average.

print average.