/in/foo.cc: In function 'int main()':
/in/foo.cc:7:6: warning: unused variable 'xmin' [-Wunused-variable]
  int xmin=2,xmax=200; 
      ^~~~
/in/foo.cc:25:4: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   x=x+2;
   ~^~~~