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POCan functions be called before "main"? If so, what happens?
 

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    <p>I know that it is always the <em>main ()</em> function being executed first, then function calls will direct the program to other functions. What if functions were <strong>called</strong> *<em>before</em>* the <em>main ()</em> function? When will they be executed?\</p> <p>I had a program (I downloaded from the Internet) and there were function calls before main( ).</p> <p>Now I don't know what they are for if execution is only done in main () (and the the functions called inside main). </p> <p><strong>HERE IS THE FRAGMENT OF THE PROGRAM:</strong></p> <pre><code>static void set_level_indices (VideoParameters *p_Vid); static void chroma_mc_setup (VideoParameters *p_Vid); static void init_img (VideoParameters *p_Vid); static void init_encoder (VideoParameters *p_Vid, InputParameters *p_Inp); static int init_global_buffers (VideoParameters *p_Vid, InputParameters *p_Inp); static void free_global_buffers (VideoParameters *p_Vid, InputParameters *p_Inp); static void free_img (VideoParameters *p_Vid, InputParameters *p_Inp); static void free_params (InputParameters *p_Inp); static void encode_sequence (VideoParameters *p_Vid, InputParameters *p_Inp); *(SOME FUNCTION DECLARATIONS OMITTED)* int main(int argc, char **argv) { init_time(); #if MEMORY_DEBUG _CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF ); #endif alloc_encoder(&amp;p_Enc); Configure (p_Enc-&gt;p_Vid, p_Enc-&gt;p_Inp, argc, argv); // init encoder init_encoder(p_Enc-&gt;p_Vid, p_Enc-&gt;p_Inp); // encode sequence encode_sequence(p_Enc-&gt;p_Vid, p_Enc-&gt;p_Inp); // terminate sequence free_encoder_memory(p_Enc-&gt;p_Vid, p_Enc-&gt;p_Inp); free_params (p_Enc-&gt;p_Inp); free_encoder(p_Enc); return 0; } </code></pre> <p>Now that I thought of it, is the <em>static</em> has something to do with these calls done before main () being okay?</p> <p>This is the encoder of H.264 in its reference software.</p> <p><strong>EDIT</strong></p> <p>Are the codes above main () function calls, function prototypes or a function declaration. You all give different answers. Please choose one and explain why by presenting the format. I really thought these statements are in the form of function calls. Furthermore, can function prototypes be included in a source code and not in the header file? Thank you!</p>
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    1. COYour question doesn't make sense. You said "I know that it is always the main() function being executed first." That means nothing else will be called before it.
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    2. COSince execution begins with `main()` how will these functions be called before that?
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    3. COwhat will happen to the functions called before the main () function? I have this program (not mine) and many function were CALLED before main(). What is the sense of putting these function calls there if they will not be executed?
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