/in/foo.cc: In function 'int level(char)':
/in/foo.cc:35:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int clac(int, int, char)':
/in/foo.cc:5:13: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
 #define MOD 32767
             ^~~~~
/in/foo.cc:50:6: note: 'ans' was declared here
  int ans;
      ^~~