/in/foo.cc: In function 'long long int fib(int)':
/in/foo.cc:12:9: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return c;
         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:18:35: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<floor(fib(n)*1.0/(fib(n-2)))<<endl;
                                   ^
/in/foo.cc:18:35: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]