/in/foo.cc: In function 'int Cal(int, int, char)':
/in/foo.cc:15:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int val(char*)':
/in/foo.cc:35:9: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return z;
         ^