QT Creator Unable to find STL outside of project, Bad install?

Hello,
I am new to C++ programming.
I was trying to write a simple hello world program.
I created a New File/C++ Source File...
Then I attempted to use includes from the STL

Code:

---

// Game1
//
// Demonstrates constants
 
#include <iostream>
using namespace std;
...

---

The: "include <iostream>" is always listed (highlighted) as an error. Why is this only happening here but not when I create a project?
Is there something wrong with my install?

Thanks in advance,

What does "hightlighted" mean?
In an editor? Or do you get a build error?

Cheers,
_

Thanks for the reply!
:-)

When I hi-light the error it says :

iostream:No Such File or Directory
It will not allow me to build or run the code.
The complete program is here:

Code:

---

// Game1
//
// Demonstrates hello
 
#include <iostream>
using namespace std;
 
int main()
{
    std::cout << "Hello World!" << std::endl;
    return 0;
}

---

What is the content of your project's .pro file?

Cheers,
_

Quote:

---

Originally Posted by anda_skoa

What is the content of your project's .pro file?

Cheers,
_

---

Where do I find the .pro file?

Quote:

---

Originally Posted by anda_skoa

What is the content of your project's .pro file?

Cheers,
_

---

There is no .pro file as I was attempting to write a single program and it is not part of a project. Is my thinking on this wrong?

If you are not using qmake to generate the build files, are you using something else or are you manually writing a Makefile?
Or are you typing the compiler invocation manually in a shell?
You need to build the program somehow :-)

Cheers,
_