token in c and cpp (C preprocessor)

C tokens are of six types, They are,

• keyword
• identifier
• constant
• string-literal
• punctuator

preprocessing-token:

• head-name
• identifer
• pp-number
• character-constant
• string-literal
• punctuator
• each non-white-space character that cannot be one of the above

reference :
ISO/IEC 9899:201x
N1570
C11

[To be continued]