Question

main.cpp

#include <vector>
#include <iostream>
#include "normal.h"
using namespace std;
int main()
{
  return 0;
}

normal.h

#ifndef NORMAL_H
     #define NORMAL_H
#include <vector>
#include <iostream>
using namespace std;
vector < int > myvector;
myvector.push_back(12);//does not name a type
#endif

I know I need to somehow include vector<int> myvector in main.cpp but can’t figure the way. I’ve looked at my previous programs and didn’t need to include anything in main.cpp.

Answer 1

The problem is that the code
myvector.push_back(12); is not inside any function. Outside of functions you may only declare (and possibly initialize) variables, you cannot put other code.

So, even though you can declare your vector in the .h file (probably to have it available in many files) you should move this line inside the main() or some other function.