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GDB allows you to express the constants of C and C++ in the
following ways:

Integer constants are a sequence of digits. Octal constants are
specified by a leading `0' (i.e. zero), and hexadecimal constants by
a leading `0x' or `0X'. Constants may also end with a letter
`l', specifying that the constant should be treated as a
long
value.

Floating point constants are a sequence of digits, followed by a decimal
point, followed by a sequence of digits, and optionally followed by an
exponent. An exponent is of the form:
`e[[+]]nnn', where nnn is another
sequence of digits. The `+' is optional for positive exponents.
A floatingpoint constant may also end with a letter `f' or
`F', specifying that the constant should be treated as being of
the
float
(as opposed to the default double
) type; or with
a letter `l' or `L', which specifies a long double
constant.

Enumerated constants consist of enumerated identifiers, or their
integral equivalents.

Character constants are a single character surrounded by single quotes
(
'
), or a numberthe ordinal value of the corresponding character
(usually its ASCII value). Within quotes, the single character may
be represented by a letter or by escape sequences, which are of
the form `\nnn', where nnn is the octal representation
of the character's ordinal value; or of the form `\x', where
`x' is a predefined special characterfor example,
`\n' for newline.

String constants are a sequence of character constants surrounded by
double quotes (
"
). Any valid character constant (as described
above) may appear. Double quotes within the string must be preceded by
a backslash, so for instance `"a\"b'c"' is a string of five
characters.

Pointer constants are an integral value. You can also write pointers
to constants using the C operator `&'.

Array constants are commaseparated lists surrounded by braces `{'
and `}'; for example, `{1,2,3}' is a threeelement array of
integers, `{{1,2}, {3,4}, {5,6}}' is a threebytwo array,
and `{&"hi", &"there", &"fred"}' is a threeelement array of pointers.
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