Certain element sum from array

new to C++ and in need of help with an array. Looking at the code below, you can see I have an array of 20 undefined elements. My queastion is how do I sum up elements from a[5] to a[14]. Only these elements. (Including them ofc)

#include <iostream>

using namespace std;

int main()
{
    
    int a[20];
    int summa;
    
    for (int i = 0; i < 20; i++) {
        a[i] = rand()%6 + 5;
        cout << a[i] << "\n";
    }
}

>Solution :

Use your knowledge of a for loop to add those values to your summa variable (which you did not initialize):

#include <iostream>

using namespace std;

int main()
{
    
    int a[20];
    // set this to 0 or your answer will be erroneous
    int summa = 0;
    
    for (int i = 0; i < 20; i++) {
        a[i] = rand()%6 + 5;
        cout << a[i] << " ";
    }
    cout << endl;

    // Now sum the values you want
    for (int i = 5; i < 15; i++) {
        summa += a[i];
    }
    cout << "Sum from 5 to 14: " << summa << endl;
}