/in/foo.cc:4:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:9:8: error: 'i' was not declared in this scope
  for(;;i++,scanf("%c",&a))
        ^
/in/foo.cc:28:8: error: 'i' was not declared in this scope
  for(;;i++,scanf("%c",&a))
        ^