Java Programs Made Easy

Q)... Get a integer array as input. Find the average of the elements which are in the position of prime index
input:{1,2,3,4,5,6,7,8,9,10}
logic:3+4+6+8(the indeces are prime numbers)
output:21

1. package Set1;
2. import java.util.*;
3. public class ClassSet20 {
4.  public static int sumOfPrimeIndices(int[] a,int n){
5.   int n1=0;
6.   for(int i=2;i<n;i++){
7.    int k=0;
8.    for(int j=2;j<i;j++)
9.     if(i%j==0)
10.      k++;
11.    if(k==0)
12.     n1+=a[i]; }
13.   return n1;
14.  }
15.  public static void main(String[] args) {
16.   Scanner s=new Scanner(System.in);
17.   System.out.println("enter the array limit:");
18.   int n=s.nextInt();
19.   System.out.println("enter the array elements:");
20.   int[] a=new int[n];
21.   for(int i=0;i<n;i++)
22.    a[i]=s.nextInt();
23.   System.out.println(sumOfPrimeIndices(a,n));
24.  }
25. }