Symbol Referencing Error

This is a discussion on Symbol Referencing Error within the C++ Programming forums, part of the General Programming Boards category; I don't know what I'm doing wrong here. Everything looks okay, but I get a Symbol Referencing Error when I ...

  1. #1
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    Jan 2008
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    2

    Symbol Referencing Error

    I don't know what I'm doing wrong here. Everything looks okay, but I get a Symbol Referencing Error when I compile.

    Header:
    ------------------------------------------
    Code:
    inline double DegreesToRadians( double Degrees );
    inline double RadiansToDegrees( double Radians );
    --------------------------------------------

    Functions:
    ------------------------------------------
    Code:
    using namespace std;
    
    #include <iostream>
    #include <iomanip>
    #include "proj03.library.h"
    
    #include <cmath>
    
    double DegreesToRadians( double Degrees )
    {
    return Degrees / 180 * 3.1416;
    }
    
    double RadiansToDegrees( double Radians )
    {
    return Radians * 180/3.1416;
    }
    ------------------------------------------------------------

    Main:
    -----------------------------------------------------------
    Code:
    using namespace std;
    
    #include <iostream>
    #include <iomanip>
    #include "proj03.library.h"
    
    int main()
    {
    cout << DegreesToRadians( 45 );
    cout << RadiansToDegrees( 1 );
    }
    ----------------------------------------------------------

    Output:
    ----------------------------------------------------------
    proj03.library.h:1: warning: inline function `double DegreesToRadians(double)' used but never defined
    proj03.library.h:2: warning: inline function `double RadiansToDegrees(double)' used but never defined
    Undefined first referenced
    symbol in file
    DegreesToRadians(double) /var/tmp//ccnvuYnr.o
    RadiansToDegrees(double) /var/tmp//ccnvuYnr.o
    ld: fatal: Symbol referencing errors. No output written to a.out
    collect2: ld returned 1 exit status
    -----------------------------------------------------------------

    WHAT IN THE WORLD IS GOING ON. I've spent hours on this already. If anyone understands what's wrong, please help me.

  2. #2
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    2,129
    put inline in both the definition and the prototype.

    Oh and if you use inline, you'll have to define it in the header file.
    Last edited by robwhit; 01-31-2008 at 06:51 PM.

  3. #3
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    Quote Originally Posted by robwhit View Post
    put inline in both the definition and the prototype.

    Oh and if you use inline, you'll have to define it in the header file.
    Where is the definition and prototype?

  4. #4
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    The definition is the thing with code, the prototype is the thing without code.

    definition
    Code:
    double DegreesToRadians( double Degrees )
    {
    return Degrees / 180 * 3.1416;
    }
    prototype
    Code:
    double DegreesToRadians( double Degrees );

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