Cannot open include file: 'iostream.h

[humble_learner]

Hi,

I am attempting to build Borland C++ 4.5 code on the VC++6.0 environment.

For a set of files I attempt to compile after creating a workspace, I get the following set of errors-

fatal error C1083: Cannot open include file: 'iostream.h': No such file or directory
fatal error C1083: Cannot open include file: 'string.h': No such file or directory
fatal error C1083: Cannot open include file: 'windows.h': No such file or directory
fatal error C1083: Cannot open include file: 'string.h': No such file or directory
fatal error C1083: Cannot open include file: 'fstream.h': No such file or directory
fatal error C1083:Cannot open include file: 'process.h': No such file or directory
fatal error C1083: Cannot open include file: 'time.h': No such file or directory

I have looked through the internet and as per the general solution to these sort of issues have done the following-

Change #include <iostream.h> to #include <iostream>
Add "using namespace std;" below the #include statements.

Despite doing the above, I still get errors like -

fatal error C1083: Cannot open include file: 'iostream': No such file or directory

The header files (both iostream.h and iostream) do exist in my machine and the path is specified in the Tools->Options->directories->Include files section.

Can someone please share your suggestions on a possible solution ?

[Krishnaa]

Check if "Ignore standard include path" is checked in project settings->C++->preprocessor

[Paul McKenzie]

The header files (both iostream.h and iostream) do exist in my machine and the path is specified in the Tools->Options->directories->Include files section.

Can someone please share your suggestions on a possible solution ?

First, do not use <iostream.h> even if it exists on your system. You should be using the standard header, <iostream>.

Second, your include path settings are probably incorrect, and you should consult your compiler's documentation on how to set the compiler's include path correctly.

Regards,

Paul McKenzie

[NMTop40]

Normally these files should automatically be put into your path when you install your compiler. V6.0 is rather old though, you should consider an upgrade.

[jayender.vs]

dont forget to add using namespace std;

[humble_learner]

Hi,

Thanks for your answers.

The include path specified in the Tools/Options/Directories/Include is correct.

I tried using #include<iostream> with "using namespace std" but the problem remained.

The customer expects the porting from BC++ to VC++6.0 and hence have no other option but to user VC++6.0

I checked the "ignore standard path" option in preprocessor settings but the problem remained.

[Krishnaa]

I see no reason why this problem should come, is it possible to post the project here ?

[NMTop40]

dont forget to add using namespace std;

as long as it's not in a header file, and it's often preferable to not add that in a source file either.

If all you are using is cout and endl you can do:

using std::cout;
using std::endl;

And that would be reasonably acceptable in a header file in this instance as it's unlikely anyone would define cout and endl to mean anything else. (Don't apply this rule in general though).

In a header file you can often include <iosfwd> rather than <iostream>.

[humble_learner]

I am sorry for the oversight. Krishnaa's solution worked. I might have made some other mistake in my hurry to get things working.

The errors were gone when I compiled once again after checking
the [Ignore standard include paths ] check box in the C/C++ - Preprocessor option.

What does checking of the option actually do to solve such errors ?

Thanks for your time.

[Krishnaa]

VC++ uses Environment variables like Include , Lib. These variables represent the paths for respective files.
In your case these variables must have been modified/corrupted/removed, causing the problem reported.
You can confirm this by looking at Environment Variables in System properties, Right click on "My Computer"->Advanced Tab ->Environment Variables button.

See if include, lib, MSDevDir etc. are there and have proper values.

You will have to reinstall(completly uninstall and install again) VC++ in order to get them back. You can manually assign values but reinstall is easy.