Simple Class definition

I decided to relearn some of the stuff i should already know.
I am trying to make a class, and a member function that displays a simple character.

here is the code that i have split into 3 files
the error i get is something like "Multiple definitions of info::display"

can anyone see what the error is?

Code:

class info
{
 public:
             
    void display();
     
  //   int length();
     
  //   char concatenate();
     
  //   char substring();
     
     
     private:
     char s;
     
     };

Code:

#include "4dot6header.h"


void info::display()
{

    
}

Code:

#include<iostream>
#include "4dot6.cpp"
using namespace std;

int main()
{
    info a;
    a.display();
    


system("pause");
return 0;
}

Instead of including "4dot6.cpp", include "4dot6header.h". "4dot6header.h" should also have header inclusion guards.

Im not understanding what u mean. can u right that in the code?

Code:

#ifndef INCLUDED_4DOT6HEADER_H_
#define INCLUDED_4DOT6HEADER_H_

class info
{
    public:

    void display();

    //   int length();

    //   char concatenate();

    //   char substring();

private:
    char s;

};

#endif

Code:

#include <iostream>
#include "4dot6header.h"
using namespace std;

int main()
{
    info a;
    a.display();

    system("pause");
    return 0;
}

Incidentally, system() is found in <cstdlib>, not <iostream>.