calculating array

[OPzCatchMee9]

I'm just learning array and I wanted to input 5 numbers and find the average. Here is what I have so far:

#include <iostream>
double comavg(double x[], int n);
using namespace std;
int main(){
	double sum = 0.0;
	double grade[5];

	for(int i = 0; i < 5; i++){
		cout << "Enter a number: ";
		cin >> sum;
		grade[i] += sum;
		
		
		
		
	
	}
	cout << comavg(grade, 5) << endl;
	system("pause");
}
double comavg(double x[], int n){
	double average = 0.0;
	for(int i = 0; i < n; i++){
		average += x[i];
		average /= 5; 
		return (average);
	}
}

Its giving me a long negative number. Thanks you.

[28poGNh0]

# include <iostream>
using namespace std;

double comavg(double x[], int n);

int main()
{
	double grade[5];

	for(int i = 0; i < 5; i++)
    {
		cout << "Enter a number: ";
		cin >> grade[i];
	}

	cout << "The average is : " << comavg(grade, 5) << endl;

    return 0;
}

double comavg(double x[], int n)
{
	double average = 0.0;

	for(int i = 0; i < n; i++)
    {
        cout << x[i] << endl;
		average += x[i];
	}

	return average /= n;
}

[OPzCatchMee9]

Thanks you very much.