Base 10 literals
Base 10 integral literal values are a sequence of one or more of the digits 0 through 9.
Examples:
i := 0;
i := 11;
i := 1023;
i:= 9223372036854775807;
The value can optionally be preceded by a sign. If the sign is omitted, + is assumed.
The number 9223372036854775807 or (263 - 1) is the largest base 10 integer literal value that can be represented.