foo.cc: In function 'int god(int, int)':
foo.cc:28:6: warning: unused variable 'a' [-Wunused-variable]
  int a,b,c,d;
      ^
foo.cc:28:8: warning: unused variable 'b' [-Wunused-variable]
  int a,b,c,d;
        ^
foo.cc:28:10: warning: unused variable 'c' [-Wunused-variable]
  int a,b,c,d;
          ^
foo.cc:28:12: warning: unused variable 'd' [-Wunused-variable]
  int a,b,c,d;
            ^
foo.cc:30:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^