Comments on: 1.7 — Forward declarations

By: Online Rollenspiele Kostenlos

Online Rollenspiele Kostenlos — Wed, 08 Sep 2010 07:00:19 +0000

That was exactly what i needed ! Thank you for your support ! =)

By: ice

ice — Tue, 07 Sep 2010 21:43:54 +0000

I tried to run your program and came up with and error like this
1>—— Build started: Project: 1, Configuration: Debug Win32 ——
1> 1.cpp
1>c:\users\marius\documents\visual studio 2010\projects\1\1\1.cpp(2): fatal error C1083: Cannot open include file: ‘iostream.h’: No such file or directory
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

By: StelStav

StelStav — Thu, 02 Sep 2010 17:50:50 +0000

Hi all,

I would like to ask what is the reasoning of c++ creators for forward declaration? Why isn’t the compiler designed in such a manner so as to look for a function definition regardless of it being before or after the actual function calling?
I would imagine that it is enough that the function definition resided in the same scope of the function call.
Would the above (my) logic effect the efficiency of the executable or just the compilation?

Thanks in advance

very nice site btw, good job admins :)

By: StelStav

StelStav — Thu, 02 Sep 2010 17:49:01 +0000

moved my question at the bottom of the queue

By: Auge

Auge — Sun, 22 Aug 2010 16:05:27 +0000

Lets have a look at your code:

int add(int x, int y);
{
return x + y;
}

The semicolon after the function header must be dropped:

int add(int x, int y)

The error message tells you that the compiler doesn’t recognize to which function the part within the curly brackets belongs to.
That’s also because of the semicolon after the function header.

By: tcp

tcp — Wed, 30 Jun 2010 14:07:52 +0000

okay so sometimes when i get to

int add(int x, int y);
{
return x + y;
}

the little dropdown-menu-checkbox doesn’t appear. why is this? the little alert box to the left of the code is green, so it’s not registering as a problem, but it refuses to run the program unless int add is a dropdown item. (the code is perfect, the only difference between the site’s code and my own is the dropdown box).

the error message:

error C2447: ‘{‘ : missing function header (old-style formal list?)

By: C++ Tutorial and Online Ebook

C++ Tutorial and Online Ebook — Wed, 30 Jun 2010 00:56:41 +0000

[...] 1.7 Forward declarations [...]

By: Zaman Ali

Zaman Ali — Thu, 17 Jun 2010 15:54:54 +0000

Its very great tutorial , it’s helpful and very good.
thank you for putting together this wonderful lessons.

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By: Ireul

Ireul — Fri, 12 Mar 2010 12:16:08 +0000

Sorry for disrespectful comment, but you miss grade school math classes.

7 + 8 – 3 * 7 = 15 – 21 = -6, the answer given by output is perfectly correct.