c++ - How to call a function from a header file -

how call function source file header file?

//h.h

extern string pic; class takepic { public:     void warpic();     void artpic();     void fatepic();     void painpic();     void nopic(); }; 

// second part of same header calls function takepic picture;

void picturetype() {     if (pic == "war")     {         picture.warpic();     }     else if (pic == "fate")     {         picture.fatepic();     }     else if (pic == "pain")     {         picture.painpic();     }     else if (pic == "art")     {         picture.artpic();     }     else     {         picture.nopic();     } } 

when says linker not working. error linker command failed exit code 1.

what happens if change

void picturetype() 

to

inline void picturetype() 

you should tell whole error message, , perhaps try searching before asking question.