[Dev-C++] linker error

[Fred J. <ph...@ya...>]

Hello
I have this linker error which makes me think that the
definition file is not being seen by the linker, this
code is taken from "Thinking in C++, 2nd Edition,
Volume 1, Annotated Solutions Guide"
Using Dev-C++ 4.9.9.2, The error is:
[Linker error] undefined reference to ‘f(int)’
all the following files are in the same dir.

thanks

//: S03:Prototypes.h
void f(int);
///:~

//: S03:Prototypes.cpp {O}
// Implements functions declared in Prototypes.h
#include <iostream>
using namespace std;

void f(int i) {
  cout << "f(" << i << ") returning void\n";
}
///:~

//: S03:ProtoTest.cpp
//{L} Prototypes
#include <iostream>
#include "Prototypes.h"

int main() {
  f(1);

  getchar();
  return 0;   
}


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