APPEND_DIGIT
APPEND_DIGIT(n2, *cp); \
APPEND_DIGIT(n ,ch);
APPEND_DIGIT(n2, *cp); \
APPEND_DIGIT(n, ch);
APPEND_DIGIT(n, ch);
APPEND_DIGIT(n2, *cp); \
APPEND_DIGIT(n ,ch);
APPEND_DIGIT(n2, *cp); \
APPEND_DIGIT(n, ch);
APPEND_DIGIT(n, ch);