为什么会编译错误：“ public static double类型非法启动”？

Question

Why is this code wrong? btw i'm kinda new

import java.util.*;

public class exercicio6_5 {
    public static Scanner sc= new Scanner (System.in);

    public static void main (String args[]) {
        double a[]=new double [sc.nextInt()];
        double val;
        int i=0;
        do
        {
            System.out.println("Valor real: ");
            val=sc.nextDouble();
            a[i]=val;
            i++;
        }
            while (i<a.length);
            System.out.println("A media é: " + media(a,i));


        }
        public static double media(int [a], int i)
        {
            int soma=0;
            int x=0;
            double med;
            do
            {
                soma=soma+a[x];
                x++;
            }
            while (x<i);
            med=soma/i;
            return media;
        }


}

The compiler error is "illegal start of type public static double" why ?

Answer 1

You have the method public static double media(int [a], int i) , this should be public static double media(double[] a, int i) since you are inputting a double array not an int array.

Also int soma = 0 needs to be double soma = 0 because you aren't trying to add integer values, rather you are trying to add double values.

Also, return media should be return med , since that is the variable you created.

Answer 2

public static double media(int [a], int i)

这应该是

public static double media(int[] a, int i)

Answer 3

Thank you all for the answers, the program is running fine now. I changed some things in the end that's why it was a bit messy with med/media and int/double but the main problem was putting media(int a[],...), thank you again for the fast answers.