/in/foo.cc: In function 'int main()':
/in/foo.cc:24:2: error: expected ';' before 'for'
  for(int a=8;a>=2;--a)
  ^~~
/in/foo.cc:24:14: error: 'a' was not declared in this scope
  for(int a=8;a>=2;--a)
              ^