What kind of system is this?
I have two comments: You need a space between -o and the binay file, like this: -o ut
The file will then be called ut.
Also, cpp is an unusual extension, most often c++ program either have .c++ or .C as extension, whereas C files have .c.

Try to create the file tst.C:
#include <iostream.h>
main
{
cout << "Hello\n";
}

Then compile:

$ g++ tst.C -o tst

Then run
$ ./tst

If there is still no go, you may have a non-standard system.

BTW: CPP is the C PreProcessor, shows you the code after macro expansions,etc.

Atle

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PS
All of the above is to be read as '... unless I am wrong'
ENDPS