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Showing content from https://timsong-cpp.github.io/cppwp/n4140/lex.ppnumber below:

[lex.ppnumber]

2.10 Preprocessing numbers [lex.ppnumber]
pp-number:
    digit
    . digit
    pp-number digit
    pp-number identifier-nondigit
    pp-number ' digit
    pp-number ' nondigit
    pp-number e sign
    pp-number E sign
    pp-number .
1

Preprocessing number tokens lexically include all integer literal tokens ([lex.icon]) and all floating literal tokens ([lex.fcon]).

2

A preprocessing number does not have a type or a value; it acquires both after a successful conversion to an integer literal token or a floating literal token.


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