When I have been studying C it was illegal C code. Well, it was long time ago. Maybe standart have been changed. Or it is just a gcc extension to C (gcc has plenty of them).

BTW function prototypes was not always part of C. IIRC some time ago you had to rewrite it as:

#include <stdio.h>

int main ( iArgC, apsqArgV )
int iArgC;
char * apsqArgV[];
{
  char szMsg[] = "Not so!";
  printf ( "Hello, world! This is cygwqin speaking.\n" );
  {
    printf ( "Now inside scope, msg is %s.\n", szMsg );
  }
  return ( 0 );         //  Success is zero in Windows.
}
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--
Ilya Martynov (http://martynov.org/)