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wenjinghuan999 2011-07-24
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无符号整数，像100l就是长整型
FrankHB1989 2011-07-24
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[Quote=引用 7 楼 zhao4zhong1 的回复:]
C++ Integer Constants
Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or……
[/Quote]
抄MDSN的lagecy manual？
科普：integer constant的说法在ISO C里有正式定义。对应在ISO C++里叫integer literal。
C++ Integer Constants
Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or……
[/Quote]
抄MDSN的lagecy manual？
科普：integer constant的说法在ISO C里有正式定义。对应在ISO C++里叫integer literal。
stein42 2011-07-24
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[Quote=引用 10 楼 schoolers 的回复:]
无符号整数unsigned
类似的有s(hort),l(ong),f(loat)...
[/Quote]
“s”后缀无效
无符号整数unsigned
类似的有s(hort),l(ong),f(loat)...
[/Quote]
“s”后缀无效
xiafeng1113 2011-07-24
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不是8位的吧，我经常见左移14位等
泡泡 2010-09-21
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慢慢来，加油
Q446512799 2010-09-21
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[Quote=引用 6 楼 iceman417 的回复:]
知之为知之，不知为不知。是知也。 只要我不知道的我就问。
[/Quote]
勤学好问
知之为知之，不知为不知。是知也。 只要我不知道的我就问。
[/Quote]
勤学好问
小魔菇 2010-09-21
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见过就熟悉了 都是这样过来的
请5楼不要BS新人
请5楼不要BS新人
wangtea 2010-09-21
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是不是代表unsigned
iceman417 2010-09-20
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知之为知之，不知为不知。是知也。 只要我不知道的我就问。
乐CC 2010-09-20
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看到楼主我真的无语了.
ayw215 2010-09-20
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无符号整数
vysnow 2010-09-20
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unsigned
hai040 2010-09-20
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unsigned
类似的有s(hort),l(ong),f(loat)...
类似的有s(hort),l(ong),f(loat)...
Csuxiaowu 2010-09-20
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无符号吧
jerry008008 2010-09-20
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[Quote=引用 9 楼 sky198306 的回复:]
基础知识不熟，现在的我也一样
[/Quote] 我也是啊
基础知识不熟，现在的我也一样
[/Quote] 我也是啊
某某9 2010-09-20
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无符号整数unsigned
类似的有s(hort),l(ong),f(loat)...
类似的有s(hort),l(ong),f(loat)...
sky198306 2010-09-20
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基础知识不熟，现在的我也一样
fujye 2010-09-20
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都是白过来的。。。我知道这种写法也才两天。。。哈哈。。。与楼主共勉
赵4老师 2010-09-20
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C++ Integer Constants
Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or hexadecimal form. They can specify signed or unsigned types and long or short types.
Syntax
integer-constant :
decimal-constant integer-suffixopt
octal-constant integer-suffixopt
hexadecimal-constant integer-suffixopt
'c-char-sequence'
decimal-constant :
nonzero-digit
decimal-constant digit
octal-constant :
0
octal-constant octal-digit
hexadecimal-constant :
0x hexadecimal-digit
0X hexadecimal-digit
hexadecimal-constant hexadecimal-digit
nonzero-digit : one of
1 2 3 4 5 6 7 8 9
octal-digit : one of
0 1 2 3 4 5 6 7
hexadecimal-digit : one of
0 1 2 3 4 5 6 7 8 9
a b c d e f
A B C D E F
integer-suffix :
unsigned-suffix long-suffixopt
long-suffix unsigned-suffixopt
unsigned-suffix : one of
u U
long-suffix : one of
l L
64-bit integer-suffix :
i64
To specify integer constants using octal or hexadecimal notation, use a prefix that denotes the base. To specify an integer constant of a given integral type, use a suffix that denotes the type.
To specify a decimal constant, begin the specification with a nonzero digit. For example:
int i = 157; // Decimal constant
int j = 0198; // Not a decimal number; erroneous octal constant
int k = 0365; // Leading zero specifies octal constant, not decimal
To specify an octal constant, begin the specification with 0, followed by a sequence of digits in the range 0 through 7. The digits 8 and 9 are errors in specifying an octal constant. For example:
int i = 0377; // Octal constant
int j = 0397; // Error: 9 is not an octal digit
To specify a hexadecimal constant, begin the specification with 0x or 0X (the case of the “x” does not matter), followed by a sequence of digits in the range 0 through 9 and a (or A) through f (or F). Hexadecimal digits a (or A) through f (or F) represent values in the range 10 through 15. For example:
int i = 0x3fff; // Hexadecimal constant
int j = 0X3FFF; // Equal to i
To specify an unsigned type, use either the u or U suffix. To specify a long type, use either the l or L suffix. For example:
unsigned uVal = 328u; // Unsigned value
long lVal = 0x7FFFFFL; // Long value specified
// as hex constant
unsigned long ulVal = 0776745ul; // Unsigned long value
Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or hexadecimal form. They can specify signed or unsigned types and long or short types.
Syntax
integer-constant :
decimal-constant integer-suffixopt
octal-constant integer-suffixopt
hexadecimal-constant integer-suffixopt
'c-char-sequence'
decimal-constant :
nonzero-digit
decimal-constant digit
octal-constant :
0
octal-constant octal-digit
hexadecimal-constant :
0x hexadecimal-digit
0X hexadecimal-digit
hexadecimal-constant hexadecimal-digit
nonzero-digit : one of
1 2 3 4 5 6 7 8 9
octal-digit : one of
0 1 2 3 4 5 6 7
hexadecimal-digit : one of
0 1 2 3 4 5 6 7 8 9
a b c d e f
A B C D E F
integer-suffix :
unsigned-suffix long-suffixopt
long-suffix unsigned-suffixopt
unsigned-suffix : one of
u U
long-suffix : one of
l L
64-bit integer-suffix :
i64
To specify integer constants using octal or hexadecimal notation, use a prefix that denotes the base. To specify an integer constant of a given integral type, use a suffix that denotes the type.
To specify a decimal constant, begin the specification with a nonzero digit. For example:
int i = 157; // Decimal constant
int j = 0198; // Not a decimal number; erroneous octal constant
int k = 0365; // Leading zero specifies octal constant, not decimal
To specify an octal constant, begin the specification with 0, followed by a sequence of digits in the range 0 through 7. The digits 8 and 9 are errors in specifying an octal constant. For example:
int i = 0377; // Octal constant
int j = 0397; // Error: 9 is not an octal digit
To specify a hexadecimal constant, begin the specification with 0x or 0X (the case of the “x” does not matter), followed by a sequence of digits in the range 0 through 9 and a (or A) through f (or F). Hexadecimal digits a (or A) through f (or F) represent values in the range 10 through 15. For example:
int i = 0x3fff; // Hexadecimal constant
int j = 0X3FFF; // Equal to i
To specify an unsigned type, use either the u or U suffix. To specify a long type, use either the l or L suffix. For example:
unsigned uVal = 328u; // Unsigned value
long lVal = 0x7FFFFFL; // Long value specified
// as hex constant
unsigned long ulVal = 0776745ul; // Unsigned long value
