/in/foo.cc: In function 'int FindMax(int, int*, int)':
/in/foo.cc:15:9: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return x;
         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:28:24: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<FindMax(max,a,n);
                        ^