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GDB allows you to express the constants of Modula-2 in the following
ways:
-
Integer constants are simply a sequence of digits. When used in an
expression, a constant is interpreted to be type-compatible with the
rest of the expression. Hexadecimal integers are specified by a
trailing `H', and octal integers by a trailing `B'.
-
Floating point constants appear as a sequence of digits, followed by a
decimal point and another sequence of digits. An optional exponent can
then be specified, in the form `E[+|-]nnn', where
`[+|-]nnn' is the desired exponent. All of the
digits of the floating point constant must be valid decimal (base 10)
digits.
-
Character constants consist of a single character enclosed by a pair of
like quotes, either single (
') or double ("). They may
also be expressed by their ordinal value (their ASCII value, usually)
followed by a `C'.
-
String constants consist of a sequence of characters enclosed by a
pair of like quotes, either single (
') or double (").
Escape sequences in the style of C are also allowed. See section C and C++ constants, for a brief explanation of escape
sequences.
-
Enumerated constants consist of an enumerated identifier.
-
Boolean constants consist of the identifiers
TRUE and
FALSE.
-
Pointer constants consist of integral values only.
-
Set constants are not yet supported.
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