/in/foo.cc: In function 'int Feibonaqieshulie(int)':
/in/foo.cc:12:6: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int sum;
      ^~~
/in/foo.cc: In function 'int Findsum(int, int)':
/in/foo.cc:28:6: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   sum+=Feibonaqieshulie(i+1);
   ~~~^~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:28:6: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   sum+=Feibonaqieshulie(i+1);
   ~~~^~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:12:6: note: 'sum' was declared here
  int sum;
      ^~~