#include <NTL/GF2.h>#include <NTL/new.h>NTL_START_IMPLvoid div(GF2& x, GF2 a, GF2 b){   if (b == 0) Error("GF2: division by zero");   x = a;}void div(GF2& x, long a, GF2 b){   if (b == 0) Error("GF2: division by zero");   x = a;}void div(GF2& x, GF2 a, long b){   if ((b & 1) == 0) Error("GF2: division by zero");   x = a;}void inv(GF2& x, GF2 a){   if (a == 0) Error("GF2: division by zero");   x = a;}void power(GF2& x, GF2 a, long e){   if (e == 0) {      x = 1;      return;   }   if (e < 0 && a == 0)       Error("GF2: division by zero");   x = a;}ostream& operator<<(ostream& s, GF2 a){   if (a == 0)      s << "0";   else      s << "1";   return s;}istream& operator>>(istream& s, GF2& x){   static ZZ a;   s >> a;   conv(x, a);   return s;} NTL_END_IMPL