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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 floating-point 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 number--the 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 character--for 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 comma-separated lists surrounded by braces `{'
and `}'; for example, `{1,2,3}' is a three-element array of
integers, `{{1,2}, {3,4}, {5,6}}' is a three-by-two array,
and `{&"hi", &"there", &"fred"}' is a three-element array of pointers.
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