I do not understand the following code...?????

Question

int arr[] = {11, 35, 62, 555, 989};
int sum = 0;

for (int x = 0; x < 5; x++) {
sum += arr[x];
}

cout << sum << endl;
//Outputs 1652

Answer 1

//First iteration
//x = 0, 0 < 5 (true)
sum += arr[x] --> 0 += 11
//sum = 11

//Second iteration
//x = 1, 1 < 5 (true)
sum += arr[x] --> 11 += 35
//sum = 46

//Third iteration
//x = 2, 2 < 5 (true)
sum += arr[x] --> 46 += 62
//sum = 108

//Fourth iteration
//x = 3, 3 < 5 (true)
sum += arr[x] --> 108 += 555
//sum = 663

//Fifth iteration
//x = 4, 4 < 5 (true)
sum += arr[x] --> 663 += 989
//sum = 1652

//Sixth iteration
//x = 5, 5 < 5 (false)
exits from loop

Output:
1652

Answer 2

This code is for sum the elements of an array so the output is 1652
sum += arr[x] where x is 0 to 4 so it will add elements of array as their index increase which is give 11+35+62+555+989=1652