/in/foo.cc: In function 'int main()':
/in/foo.cc:6:6: warning: unused variable 'a' [-Wunused-variable]
  int a=1,b=1,tmp;
      ^
/in/foo.cc:6:10: warning: unused variable 'b' [-Wunused-variable]
  int a=1,b=1,tmp;
          ^
/in/foo.cc:6:14: warning: unused variable 'tmp' [-Wunused-variable]
  int a=1,b=1,tmp;
              ^