loop for array container

[keane234]

Hi, I m new to the C++ and got stuck with follwoing assignment question.
Which three different loop forms is best suited for processing the elements of an array container? Justify your answer.

I think the answer is
Array container are part of the STL(standard template library of c++) the three major ways to itearte over the array containers

1) For loop

2) for each loop

3) iterator


However, I cannot find online or textbook to justify that they are the best loop form for array container.

[TwilightSpectre]

Well, they are really the only way. I'm assuming you mean looping by index, by iterator and using the C++11 ranged for loop - std::for_each works a bit differently, applying a function to every object in the range.

So, I'd say you should have:

std::array<int, 5> arr = {0, 1, 2, 3, 4};

for (std::size_t i = 0; i < arr.size(); ++i)
    std::cout << arr[i] << " ";
// OR
for (auto it = arr.begin(); it != arr.end(); ++it)
    std::cout << *it << " ";
// OR
for (auto x : arr)
    std::cout << x << " ";

[TheToaster]

One thing to add:

for (auto& x : arr)
    std::cout << x << " ";

You could use a reference in this range-based for loop if you want to actually change each element.