/in/foo.cc: In member function 'bool lnum::operator=(const lnum&)':
/in/foo.cc:13:3: warning: no return statement in function returning non-void [-Wreturn-type]
   }
   ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:82:63: warning: narrowing conversion of '(((int)s[j]) - 48)' from 'int' to 'short int' inside { } [-Wnarrowing]
             sum[i][j]=sum[i][j-1]*(lnum){{0,1},2}+(lnum){{s[j]-'0'},1};
                                                           ~~~~^~~~