Problem in C++

azhar_lisec · 11-06-2007, 04:40 AM

hi everybody ,
I am new in C++ in linux.
I just run the sample program in linux. But it shows one error
Can any body tell me the reason and also give solution for my problem.

Error message below:
In function int main():
cout is not declared in this scope

source code :
#include<iostream.h>
int main
{
cout <<"hello world";
return 0;
}

reply to my thread

by
Azharudeen Ahmed.P.A.

gjagadish · 11-06-2007, 04:56 AM

u missed parenthesis '()' while defining main function

correct code is

#include<iostream.h>
int main()
{
cout <<"hello world";
return 0;
}

azhar_lisec · 11-06-2007, 05:00 AM

I used the parenthesis . but that error has came..

Quote:

Originally Posted by gjagadish

u missed parenthesis '()' while defining main function

correct code is

#include<iostream.h>
int main()
{
cout <<"hello world";
return 0;
}

gjagadish · 11-06-2007, 05:03 AM

which compiler did u use to compile ur program?

use c++ or g++

azhar_lisec · 11-06-2007, 05:12 AM

i used g++ and c++ compiler. I dont know what mistakes made .

Quote:

Originally Posted by gjagadish

which compiler did u use to compile ur program?

use c++ or g++

matthewg42 · 11-06-2007, 05:49 AM

cout and friends are defined in the namespace std. Also, the iostream header file does not have the .h on it any more. Prior to standardisation these things were not always the case, so perhaps your sample code was written from guidelines which predate the implementation of the standard.

To use things which are defined in a given namespace, you can either prefix the name of the thing with namespace:: or you can include a use namespace ... statement, which will bring things from that namespace into the global namespace. For example, either of these should work:

Code:

#include <iostream>

using namespace std;

int main()
{
    cout << "Hello world" << endl;
    return 0;
}

or:

Code:

#include <iostream>

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