/in/foo.c: In function 'main':
/in/foo.c:33:10: warning: unused variable 'd' [-Wunused-variable]
  int b,c,d;
          ^
/in/foo.c:33:8: warning: unused variable 'c' [-Wunused-variable]
  int b,c,d;
        ^
/in/foo.c:33:6: warning: unused variable 'b' [-Wunused-variable]
  int b,c,d;
      ^