Path separator in #include: backslash or forward slash?

[Vladislav Boyko]

Backslash:

#include "src\file.mqh"

Forward slash:

#include "src/file.mqh"

Both options compile. Are they equally correct, or is one of them "more" correct?

I would like to use forward slash (probably because it is used in Linux). However, I want to make sure this won’t cause any issues, as I haven’t seen forward slashes used in the documentation.

[William Roeder]

The first is not correct. A backslash must be properly escaped. Character Constants - Integer Types - Data Types - Language Basics - MQL5 Reference 

[Ryan L Johnson]

William Roeder #:
The first is not correct. A backslash must be properly escaped. Character Constants - Integer Types - Data Types - Language Basics - MQL5 Reference 

Is this "more" correct?:

#include <Trade\Trade.mqh>
#include <Trade\OrderInfo.mqh>
#include <Trade\DealInfo.mqh>
#include <Trade\HistoryOrderInfo.mqh>

(It works).

[Vladislav Boyko]

William Roeder #:
The first is not correct. A backslash must be properly escaped. Character Constants - Integer Types - Data Types - Language Basics - MQL5 Reference 

This is interesting, thank you. Although the following code works (I checked), it doesn't look very cool.

#include "src\new.mqh"

[Vladislav Boyko]

Vladislav Boyko #:

This is interesting, thank you. Although the following code works (I checked), it doesn't look very cool.

If anyone didn't immediately figure out why that code looks questionable:

void OnStart()
  {
   Print("src\new.mqh");
  }

[Ryan L Johnson]

Vladislav Boyko #:

This is interesting, thank you. Although the following code works (I checked), it doesn't look very cool.

Ah ha. That appears to be unique for the string format directory.

[Stanislav Korotky]

Vladislav Boyko:

Backslash:

Forward slash:

Both options compile. Are they equally correct, or is one of them "more" correct?

I would like to use forward slash (probably because it is used in Linux). However, I want to make sure this won’t cause any issues, as I haven’t seen forward slashes used in the documentation.

You can use either except for embedded resources. I use forward slashes because they are always written 'as is', and backslashes may require escaping in many cases.