foo.cc: In function ‘int calcs(int, int)’:
foo.cc:33:19: warning: value computed is not used [-Wunused-value]
   33 |         calcs(x,n)+calcs(0,y);
      |         ~~~~~~~~~~^~~~~~~~~~~
foo.cc:34:1: warning: control reaches end of non-void function [-Wreturn-type]
   34 | }
      | ^