/in/foo.cc:37:14: warning: invalid suffix on literal; C++11 requires a space between literal and string macro [-Wliteral-suffix]
     sscanf(c,"%"ll,&bt[++len]);
              ^
/in/foo.cc:42:13: warning: invalid suffix on literal; C++11 requires a space between literal and string macro [-Wliteral-suffix]
    sscanf(c,"%"ll,&bt[++len]);
             ^
/in/foo.cc:47:10: warning: invalid suffix on literal; C++11 requires a space between literal and string macro [-Wliteral-suffix]
   printf("%"ll,bt[len]);
          ^
/in/foo.cc:49:11: warning: invalid suffix on literal; C++11 requires a space between literal and string macro [-Wliteral-suffix]
    printf("%08"ll,bt[i]);
           ^
/in/foo.cc: In member function 'BIGNUM BIGNUM::operator=(LL)':
/in/foo.cc:30:75: warning: no return statement in function returning non-void [-Wreturn-type]
  BIGNUM operator = (LL x) {len = 1;memset(bt,0,sizeof bt);bt[1]=x;upbit();}
                                                                           ^
/in/foo.cc: In member function 'BIGNUM BIGNUM::mul(LL)':
/in/foo.cc:64:2: warning: no return statement in function returning non-void [-Wreturn-type]
  }
  ^