#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
 
#define BYTE 256
#define GetBit(array_name, index) \
  (((index) < (array_name)[0]) && ((index) >= 0)) ? \
  (((array_name)[((index) / BYTE) + 1] & ( (unsigned long)1 << \
    ((index) % BYTE))) ? 1 : 0) : \
  (FatalError("Index %ld out of range 0..%ld\n", (long)(index), \
    (long)(array_name)[0]), 0)
 
void FatalError(const char *fmt, ...) {
  va_list args;
  va_start(args, fmt);
  vfprintf(stderr, fmt, args);
  va_end(args);
  exit(EXIT_FAILURE);
}
 
int main(void) {
  int a[] = {1000, 1, 2, 3, 4, 5};
  GetBit(a, 2);
  return 0;
}

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