CODEWITHSUNDEEP
c++iostdmembercout
Paul Hannon
Paul Hannon

Reputation: 2713

cout is not a member of std

I'm practicing using mulitple files and header files etc. So I have this project which takes two numbers and then adds them. Pretty simple.

Here are my files:

main.cpp

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

int main()
{
    int x = readNumber();
    int y = readNumber();

    writeAnswer(x + y);

    return(0);
}

io.cpp

int readNumber()
{
    int x;

    std::cout << "Number: ";
    std::cin >> x;

    return x;
}

void writeAnswer(int x)
{
    std::cout << "Answer: ";
    std::cout << x;
}

add.h

#ifndef ADD_H_INCLUDED
#define ADD_H_INCLUDED

int readNumber();
void writeAnswer(int x);

#endif // #ifndef ADD_H_INCLUDED

The error is showing up in io.cpp. The exact errors are:

enter image description here

Does anyone have any idea why this may be happening? Thanks.

EDIT: I made a small project yesterday with the same amount of files (2 .cpp and 1.h) and I didn't include the iostream header in the other .cpp and it still compiled and ran fine.

Upvotes: 269

Views: 455816

Answers (3)

Jukes
Jukes

Reputation: 447

If you're using pre-compiled headers with Microsoft's compiler (MSVC), remember that it must be:

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

and not the other way around:

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

In other words, the pre-compiled header include file must always come first. (The compiler should give you an error specifically explaining this if you forget.)

Upvotes: 29

Marco Rubio
Marco Rubio

Reputation: 71

I had a similar issue and it turned out that i had to add an extra entry in cmake to include the files.

Since i was also using the zmq library I had to add this to the included libraries as well.

Upvotes: 1

unkulunkulu
unkulunkulu

Reputation: 11922

add #include <iostream> to the start of io.cpp too.

Upvotes: 449

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