Get sense of internal linkage and external linkage

I have learned C for months and now I want to learn C++. I usually learned C by reading and compiling only one souce file. I have no experience compiling multiple source file. When I learn C++ tutorial, I confuse with linkage concept. I have read their definition. The definition is clear but my mind is not. I just want get sense of linkage concept by compiling the source files. I want to get the example. So could you give me a simple example to get sense of internal linkage and external linkage especially related with const and inline functions concept???

I am new for this board. Is this question suitable for this forum?? I have searced with the search engine in this forum without any helping result.

Thanx.

Took me ages to get a handle on this.

Say you have a main file and you want to use a function that prints a string:

Code:

---

//  main.cpp
#include <string>
#include "MyHeader.h"
using namespace std;

int main()
{
    string Welcome("Welcome to my program!");

    PrintString(Welcome);

    return 0;
}

---

Then you have a header file, which provides the link for the compiler to the PrintString() function.

Code:

---

//  MyHeader.h
#ifndef MYHEADER_H
#define MYHEADER_H

#include <string>
using namespace std;

void PrintString(string ToPrint);

#endif

---

Then you have the .cpp file that contains the code to PrintString()

Code:

---

//  PrintStr.cpp
#include <string>
#include <iostream>
#include "MyHeader.h"
using namespace std;

void PrintString(string ToPrint)
{
    cout << ToPrint;
}

---

The #ifndef and #define ensure that the file isn't included multiple times per file (i.e some other include also includes this header).
edit: Like how my .cpps include <string> but MyHeader also includes <string>