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A *decimal number* is any sequence of decimal digits, not
beginning with ‘`0`’.

An *octal number* is ‘`0`’ followed by any number of octal
digits (‘`0`’ through ‘`7`’), for example: `0340`

.

A *hex number* is ‘`0x`’ or ‘`0X`’ followed by any number
of hex digits (‘`0`’ through ‘`9`’ and ‘`a`’ through ‘`f`’
or ‘`A`’ through ‘`F`’), for example: `0x3ef1`

.