#include <inttypes.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>

#define ISQRT(n)\
  ({ __typeof__(n) r = 0, _n = (n), i = 1;\
  i = i << ((sizeof(i) * CHAR_BIT - (0 > ~i ? 2 : 1)) / 2) * 2;\
  if(0 > _n) _n = -_n;\
  for(; i; i >>= 2)\
    if(_n >= (i | r)){\
      _n -= i | r;\
      r = r >> 1 | i;\
    } else r >>= 1;\
  r; })

int main(int argc, char *argv[]){
 for(int i = 1; i < argc; ++i){
  intmax_t n = strtoimax(argv[i], NULL, 0);
   printf("isqrt(%jd) == %jd%s\n", n, ISQRT(n), n < 0 ? "i" : "");
 }
 return 0;
}