Solving the error: cout is not a member of std

Question

I am trying to write a cpp that returns an invalid answer. I don’t know where the incorrect command is in the “cout is not a member of std”. My detail is:

#include <iostream>
 #include "add.h"
 
 int main()
 {
  int x = readNumber();
  int y = readNumber();
 
  writeAnswer(x + y);
 
  return(0);
 }

int readNumber()
 {
  int x;
 
  std::cout << "Number: ";
  std::cin >> x;
 
  return x;
 }
 
 void writeAnswer(int x)
 {
  std::cout << "Answer: ";
  std::cout << x;
 }

#ifndef ADD_H_INCLUDED
 #define ADD_H_INCLUDED
 
 int readNumber();
 void writeAnswer(int x);
 
 #endif // #ifndef ADD_H_INCLUDED

and I end up with the warning message:

error: ‘cout’ is not a member of ‘std’

Pls, suggest the best answer to fix it.

lyytutoria · Accepted Answer

The cause:

The start of io.cpp is missing #include , so the error happens. Solution: You can solve this problem by adding #include to the start of io.cpp If you are using the zmq library, another way to solve this error is adding an extra entry in cmake to include the files and the included libraries also need to be added this.

Mila Bocquet · Answer

Remember that it must be:

#include "stdafx.h"
#include

It's not the other way around

#include 
#include "stdafx.h"

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Solving the error: cout is not a member of std