for loop : C++ and python

Question

I understand how to use a for loop like

for (x = 0 ; x<5 ; x++ ) { // some_code }

in C++ but what about a for loop like

for x in y:

which exist at least in python

Are you asking, how does one iterate over a container in C++ in the same way? — Sneftel
– Sneftel, Commented Mar 3, 2014 at 21:12

juanchopanza · Accepted Answer · 2014-03-03 21:12:12Z

6

The closest equivalent is a range based for-loop. For example,

auto y = {0, 1, 2, 3, 4, 5, 6};

for (auto i : y)
{
  // do something with i
}

There are more details, but these depend on what you want to do. The C++ semantics are quite different to python's.

answered Mar 3, 2014 at 21:12

juanchopanza

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1 Comment

juanchopanza Over a year ago

@SethMMorton Yes, both the use of auto and the range based for-loop are C++11.

Ardel · Accepted Answer · 2014-03-03 21:22:01Z

0

In C++ you can use std::for_each which can be answer for you question. More information you can find here.

answered Mar 3, 2014 at 21:22

Ardel

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Comments

imkort · Accepted Answer · 2014-03-03 21:23:21Z

0

The for i in range(5) loop would "look" for i in the [0, 1, 2, 3, 4], so it would be quite similar in working as a C++ for (int i = 0; i < 5; ++i).

answered Mar 3, 2014 at 21:23

imkort

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3 Comments

imkort Over a year ago

I don't think that matters. There was a question on understanding how to use the for loop in python, the example I have used is clearer to get I think, as the y would be a collection, wouldn't it?

juanchopanza Over a year ago

Of course it matters, because the C++ loop you show is only equivalent to the python loop if you have a sequence of integers 0, 1, 2, ...

imkort Over a year ago

This is why I have used the above example. Quick thought: @user2803490 gets the C/C++ loop, so my example might help him understand the idea.

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