see the documents

use c++ or java or any languages

c++ is better

Examples
catfood is the single identifier catfood.
catfood45 is the single identifier catfood45.
1tabs, spaces, new lines
1
catfood-45 is three tokens: the identifier catfood, the punctuation -, and the number 45.
catfood67. is a syntax error. The identifier catfood67 is followed by a single period, which
is not a valid token.
45) is two tokens, the number 45 and the punctuation ).

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