visual studio 2012 c++ no cout

Question

I'm trying to learn c++ but a simple method like "cout" and "cin" does not exist this is my code:

#include "stdafx.h"
#include <iostream>


int _tmain(int argc, _TCHAR* argv[])
{
    cout>>"hello";
    return 0;
}

there is an error that says "error C2065: 'cout' : undeclared identifier"

and "IntelliSense: identifier "cout" is undefined"

Your angle brackets are backwards. Try `std::cout << "hello"`. — Bill Carey, Jul 29 '13 at 18:06
`cout` is in the `std` namespace. Try `std::cout << "hello";` — Praetorian, Jul 29 '13 at 18:06
I just open a project in visual studio 2012. I only added the: cout<<"hello"; — user2302416, Jul 29 '13 at 18:09
@user2302416: Yes, and that's why it's not working. Change `cout<<"hello";` to `std::cout << "hello";` -- or, better yet, `std::cout << "hello\n";`. You *could* drop the `std::` by adding `using namespace std;`; you'll see a lot of code that does that, but it's often considered to be a bad habit. — Keith Thompson, Jul 29 '13 at 18:41

score 8 · Accepted Answer · answered Jul 29 '13 at 18:06

8

cout is declared in the std namespace:

int _tmain(int argc, _TCHAR* argv[])
{
    std::cout << "hello";
    return 0;
}

You're also doing it wrong. Note how I have the angle brackets aboove.

answered Jul 29 '13 at 18:06

John Dibling

99,718
31
186
324

`_t` in front of `main()` ? – Grijesh Chauhan Jul 29 '13 at 18:07
2

@GrijeshChauhan:L This is a Windows thing. – John Dibling Jul 29 '13 at 18:08
is there a thing that I can use instead of visual studio 2012 to learn c++? – user2302416 Jul 29 '13 at 18:14
@user2302416: Under Windows? – John Dibling Jul 29 '13 at 18:14
@user2302416 MinGW is a good compiler for Windows, along with either Qt Creator or Code Blocks. – Rapptz Jul 29 '13 at 18:15
3

You can also use VS2012 and write Standard code. Just create a Win32 console project, forget all the precompiled header stuff, and write a main.cpp from scratch in an empty project. I think you'll be hard pressed to find a compiler that is as powerful and easy to use as VS. – John Dibling Jul 29 '13 at 18:16

score 1 · Answer 2 · edited Jun 06 '15 at 19:50

1

Add #include <iostream> to stdafx.h. I was having trouble with that and it worked for me.

edited Jun 06 '15 at 19:50

Dan Getz

8,774
6
30
64

answered Jun 06 '15 at 17:15

user4981778

11
1

score 0 · Answer 3 · answered Jul 29 '13 at 18:08

0

Adding using namespace std; may help, and also do cout << "hello" not >>.

answered Jul 29 '13 at 18:08

Iosif Murariu

2,019
1
21
27

what's bad at using a namespace? – Iosif Murariu Jul 29 '13 at 18:09
1

`using namespace std` can create many more problems than it solves, especially when done in a header file. – John Dibling Jul 29 '13 at 18:09
@IosifM. It's considered bad for [many, many reasons](http://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice) – Praetorian Jul 29 '13 at 18:10
@Praetorian, I agree that "collisions" may occur on "custom-made" namespaces, but still... namespace std? – Iosif Murariu Jul 29 '13 at 18:11
It wasn't, but you did not explain how doing `using namespace std` can be a problem, even in a source file, so to a newbie this could be taken as *the* solution. Hence you are effectively suggesting that this is an appropriate solution in all contexts, which it's not. – John Dibling Jul 29 '13 at 18:12
Don't teach bad habits regardless of it. Namespace pollution is bad. See [here](http://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice). – Rapptz Jul 29 '13 at 18:12
pulling in a full namespace for something this simple is plainly overkill anyways. – user2366842 Jul 29 '13 at 18:12
It's even worse with `namespace std` because it contains all sorts of generic sounding names, such as `find` or `accumulate` (or practically anything from ``) – Praetorian Jul 29 '13 at 18:13
OK, I guess you've proven your point pretty well :). Was just curious why it's good to avoid namespaces. – Iosif Murariu Jul 29 '13 at 18:14
so I should'nt use the namespace? – user2302416 Jul 29 '13 at 18:17
@user2302416: No, you should not use a `using namespace` declaration until you know exactly what you're doing. – John Dibling Jul 29 '13 at 18:18
for std specifically you're pretty much always better off calling the namespace directly as needed because of the sheer amount of different functions that it implements....otherwise there's always the old C way of using printf instead of cout. – user2366842 Jul 29 '13 at 18:21

score 0 · Answer 4 · answered Aug 11 '16 at 18:46

cout is in std so you to have use using namespace std. And for cout operator is like <<. >> this is for input i.e cin.

#include "stdafx.h";
#include "iostream";
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    cout<<"hello";
    system("pause");
    return 0;
}

visual studio 2012 c++ no cout

4 Answers4