C function syntax, parameter types declared after parameter list -

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I'm relatively new to C. I have come in a form of function syntax which I have never seen before, where parameter types are defined after that parameter list. Can anyone explain to me how this is different from the normal function syntax?

Example: 

  int main (argc, argv) int argc; Four * argv []; {Return (0); }   
 
 
 This is an old-style syntax for parameter lists, which is still supported . K & amp; In RC you can also leave type announcements and they will default on int I.e.  
  main (argc, argv) char * argv []; {Return 0; }  
 
 will have the same function.

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