/in/foo.cc: In function 'long long int wdnmd(long long int)':
/in/foo.cc:9:14: error: 'x' cannot be used as a function
  return x(n-1)+x(n-2); 
              ^
/in/foo.cc:9:21: error: 'x' cannot be used as a function
  return x(n-1)+x(n-2); 
                     ^