/in/foo.cc: In function 'int main()':
/in/foo.cc:62:6: warning: unused variable 'a' [-Wunused-variable]
  int a;int b;int W;
      ^
/in/foo.cc:62:12: warning: unused variable 'b' [-Wunused-variable]
  int a;int b;int W;
            ^
/in/foo.cc:62:18: warning: unused variable 'W' [-Wunused-variable]
  int a;int b;int W;
                  ^