Code from https://youtu.be/2Uj8onRcsvw?list=PLW2zQ3qR7RL7_bej-w7ARrgxayyD_f2xo.

main.cpp

#include <iostream>
#include <algorithm>

using namespace std;

void cube(int& l) {
    l = l * l * l;
}

int main() {
    int nums[] {1, 3, 5, 7, 11};

    int before = -75;

//    for (int i = 0; i < 5; i++) {
//        cout << "nums[" << i << "] = " << nums[i] << endl;
//    }


//    for (int& n : nums) {
////        n = n * 2;
//        n *= 2;
//        cout << n << endl;
//    }

//    for (auto& n : nums) {
//        cube(n);
//    }

//    for_each(begin(nums), end(nums), cube);
    for_each(begin(nums), end(nums), [](int& l){
        l = l * l * l;
    });

//    for (auto n : nums) {
//        cout << n << ' ';
//    }
    for_each(begin(nums), end(nums), [](auto l){
        cout << l << ' ';
    });
    cout << endl;
    int after = 123;

//    cout << "nums[5] = " << nums[5] << endl;
//    cout << "nums[-1] = " << nums[-1] << endl;
//
//    for (int i = 6; i < 20; i++) {
//        nums[i] = nums[i] * 2;
//        cout << "nums[" << i << "] = " << nums[i] << endl;
//    }
//    cout << "before = " << before << endl;
//    cout << "after = " << after << endl;

//    cout << "nums[10000] = " << nums[10000] << endl;
}