Thread: C++ cout

What compiler/IDE do you have? What have you tried? What errors are you getting?

Try this:

Code:

#include <iostream>

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

I'm really new to C++ but as far as I read and attempted to compile you need the:

Code:

using namespace std;

So you could use just cout without the std::

Example:

Code:

#include <iostream>

using namespace std;

int main()
{
    cout << "Hello World\n";
    return(0);
}

Originally Posted by Devil Panther

I'm really new to C++ but as far as I read and attempted to compile you need the:

Code:

using namespace std;

So you could use just cout without the std::

Example:

Code:

#include <iostream>

using namespace std;

int main()
{
    cout << "Hello World\n";
    return(0);
}

While that's true, once you start working with multiple namespaces, you'll wish you'd used std::. Using std:: also helps you understand what is in the namespace std and what is not.

I really wouldn't know about multiple namespaces, I just started C++ last week or so... finally moved on from C

But can you please explain what do you mean by multiple namespaces, and why is it better to work with std:: ?

once you start working with multiple namespaces, you'll wish you'd used std::

If you really wanted to do that couldn't you just use std:: at the beginning with

Code:

using std::cout;

or is that the same idea as namespace std?
And whoever said death to Visual Basic, what is bad about it because I asked for a Visual Basic .NET book for my birthday (being foolishly new to standalone apps just having come from the world of JavaScript about a month ago).

I see... One last thing, what are namespaces??? Since books and guides use them, but non of them really explain the subject... is it like a class?

p.s: I'm sorry if this is a really stupid question

Originally Posted by beanroaster

And whoever said death to Visual Basic, what is bad about it because I asked for a Visual Basic .NET book for my birthday (being foolishly new to standalone apps just having come from the world of JavaScript about a month ago).

yeah... well it's easier than C/C++ and limited as well, I simply don't believe it's a good language to start with (like many people do) nor I belive it's a good lanauge to develope heavy or even mideum size apps. But that's just me

Originally Posted by Devil Panther

I see... One last thing, what are namespaces??? Since books and guides use them, but non of them really explain the subject... is it like a class?

p.s: I'm sorry if this is a really stupid question

a namespace isn't a class it is as it says a namespace. It is kind of hard to explain.

Code:

#include <iostream>

namespace ns
{
    void addSomething()
    {
        std::cout<<5 + 7<<std::endl;
    }
}
void addSomething()
{
    std::cout<<2 + 4<<std::endl;
}

int main()
{
    addSomething();
    ns::addSomething();
    
    std::cin.get();
    
    return 0;
}

This is a generic example but it gets the point across what a namespace does.

Originally Posted by beanroaster

If you really wanted to do that couldn't you just use std:: at the beginning with

Code:

using std::cout;

or is that the same idea as namespace std?

using std::cout is sort of the same idea as using namespace std;. using namespace std allows all of the objects/functions of that namespace to be used without the std:: in front, which could cause conflicts if any other part of the program had a thing named cout, etc. using std::cout poses the same problem: if theres another thing named cout in the program it could potentially cause a conflict, however since its only using std::cout, cin and the rest of the namespace std wouldnt pose any problem ever, where as with using namespace std its using the entire namespace and potentially could. Then theres std::, and that poses no problems ever unless you happened to name one of your namespaces std

Then theres std::, and that poses no problems ever unless you happened to name one of your namespaces std

Thats what I did the first few days of my C++ programming and all of those colons got really annoying once I started making bigger things.

Originally Posted by beanroaster

Thats what I did the first few days of my C++ programming and all of those colons got really annoying once I started making bigger things.

I find they make my programs look programming-like complex so I like using it for that reason.. sort of like I know what the hell I'm doing.