Really basic question plz answer quickly 1

[romanstandrd]

I tried compiling a "hello world" script but I got this error message:

Compiling...
testprgm.cpp
testprgm.cpp(2) : error C2019: expected preprocessor directive, found '<'
testprgm.cpp(6) : error C2065: 'cout' : undeclared identifier

Why doesn't it work? Am I even supposed to compile it first? Thank you.

 

[Unrivaled1]

Is this a c++ program, or Visual c++?

Try replacing cout with std::cout and see if that helps.

 

[romanstandrd]

nope, didnt work. got this log instead:

Compiling...
testprgm.cpp
testprgm.cpp(2) : error C2019: expected preprocessor directive, found '<'
testprgm.cpp(6) : error C2653: 'std' : is not a class or namespace name
testprgm.cpp(6) : error C2065: 'cout' : undeclared identifier

 

[romanstandrd]

oh sorry, its a visual c++ project, with a c++ program in it.

 

[Unrivaled1]

I don't have much experience with running one within another. Didn't even know that could be done.

 

[Salem]

Post your actual code.
Please use the [tt][ignore]

[/ignore][/tt] tags when posting code.

--

 

[romanstandrd]

# <ostream.h>

int main()
{
	std::cout << "Hello world! (and Eric)" << '/n';
	
	return 0;
}

 

[romanstandrd]

whoops i didnt mean to put the version with std:: in there. I don't even know if it's a problem with the code though... thanks for your help everyone.

 

[ArkM]

Oh my!...

#include <iostream>

 

[VincentP]

Just for future info romanstandrd, you see that your error was really simple, but impossible to figure out without the relevant code. Always put enough information! A four line program which can reproduce the error is great!

Vincent

 

[drewdaman]

also note that if you use

#include <iostream>

you have to say

std::cout<<"whatever"<<endl;

if you use:

#include <iostream>
//other includes
//using namespace std;

then you just say

cout<<"whatever"<<endl;

do not use #include <iostream.h> .. you can say cout<<"whatever" with that.. but it is an old header and should no longer be used. the same is true for many other common libraries.

 

[romanstandrd]

Thank you very much everyone! But... AH HA! It still doesn't work. Now using the exact code:

# <iostream>

int main()
{
	std::cout<<"Hello world! (and Eric)"<<endl;
	
	return 0;
}

returns the copile error message:
Compiling...
testprgm.cpp
testprgm.cpp(2) : error C2019: expected preprocessor directive, found '<'
testprgm.cpp(6) : error C2653: 'std' : is not a class or namespace name
testprgm.cpp(6) : error C2065: 'cout' : undeclared identifier
testprgm.cpp(6) : error C2065: 'endl' : undeclared identifier

 

[ArkM]

Do you know anything about C/C++ preprocessor directive #include? Read a book carefully before copy a text from it.

#include <iostream>

but it's absolutely senseless statement:

# <iostream>

 

[drewdaman]

the "#" part tells the compiler of a preprocessor directive (loosely speaking). you have to tell it what to do after that. "include" in your case.

also an ammendment to my previous post. i said:

also note that if you use

#include <iostream>
you have to say

std::cout<<"whatever"<<endl;

std::cout<<"whatever"<<endl;
should be
std::cout<<"whatever"<<std::endl;

 

[romanstandrd]

Thanks a bunch guys for everything; it worked of course. It's always those fun little things.