/in/foo.c: In function 'main':
/in/foo.c:5:10: warning: unused variable 'c' [-Wunused-variable]
  int a,b,c;
          ^
/in/foo.c:5:8: warning: unused variable 'b' [-Wunused-variable]
  int a,b,c;
        ^
/in/foo.c:5:6: warning: unused variable 'a' [-Wunused-variable]
  int a,b,c;
      ^