Ordinary decimal notation is used for numbers that are constants of type integer and real.

A hexadecimal integer constant uses a  dollar sign ($) as a prefix.

Engineering notation (E or e, followed by an exponent) is read as "times 10 to the power of" in real types. For example:

Numbers with decimals or exponents denote real-type constants.

Other decimal numbers denote integer-type constants; they must be between -2,147,483,648 and 2,147,483,647.

Hexadecimal numbers

Hexadecimal numbers denote integer-type constants; they must be between $00000000 and $FFFFFFFF.

The resulting value's sign is implied by the hexadecimal notation.