How can I convert this python for-loop using a range into C++?

Question

Consider this Python for loop using a range :

for i in range(n-2, -1, -1):

As the loop iterates, i takes on the values n-2 , n-3 , until 0 .

What is the equivalent code in C++?

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^{This question is copied almost verbatim from another deleted question .}

Answer 1

The equivalent code in C++ :

for(int i = n-2 ; i > -1 ; i--) {
    ...
}

Answer 2

While the classic for(;;) loop can be used for any iteration that you can imagine, your particular loop can be written more readably like this:

namespace sv = std::views;

for (int i : sv::iota(0, n-1) | sv::reverse)
{
  // ...
}

Here's a demo .

For completeness, here's what a classic for(;;) loop would look like:

for (int i = n-2; i > -1; --i)
{
  // ...
}

In my opinion, this is more cognitive effort, precisely because I have to run the iteration in my head by reading the syntax. I find the first version reads more naturally.