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赵4老师 2011-03-16
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[Quote=引用 2 楼 wangw89 的回复:]
还有，在程序中的“0L”代表多大的数值？
[/Quote]
C Integer Constants
An “integer constant” is a decimal (base 10), octal (base 8), or hexadecimal (base 16) number that represents an integral value. Use integer constants to represent integer values that cannot be changed.
Syntax
integer-constant :
decimal-constant integer-suffix opt
octal-constant integer-suffix opt
hexadecimal-constant integer-suffix opt
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-suffix opt
long-suffix unsigned-suffix opt
unsigned-suffix : one of
u U
long-suffix : one of
l L
64-bit integer-suffix :
i64
Integer constants are positive unless they are preceded by a minus sign (–). The minus sign is interpreted as the unary arithmetic negation operator. (See Unary Arithmetic Operators in Chapter 4 for information about this operator.)
If an integer constant begins with the letters 0x or 0X, it is hexadecimal. If it begins with the digit 0, it is octal. Otherwise, it is assumed to be decimal.
The following lines are equivalent:
0x1C /* = Hexadecimal representation for decimal 28 */
034 /* = Octal representation for decimal 28 */
No white-space characters can separate the digits of an integer constant. These examples show valid decimal, octal, and hexadecimal constants.
/* Decimal Constants */
10
132
32179
/* Octal Constants */
012
0204
076663
/* Hexadecimal Constants */
0xa or 0xA
0x84
0x7dB3 or 0X7DB3
还有，在程序中的“0L”代表多大的数值？
[/Quote]
C Integer Constants
An “integer constant” is a decimal (base 10), octal (base 8), or hexadecimal (base 16) number that represents an integral value. Use integer constants to represent integer values that cannot be changed.
Syntax
integer-constant :
decimal-constant integer-suffix opt
octal-constant integer-suffix opt
hexadecimal-constant integer-suffix opt
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-suffix opt
long-suffix unsigned-suffix opt
unsigned-suffix : one of
u U
long-suffix : one of
l L
64-bit integer-suffix :
i64
Integer constants are positive unless they are preceded by a minus sign (–). The minus sign is interpreted as the unary arithmetic negation operator. (See Unary Arithmetic Operators in Chapter 4 for information about this operator.)
If an integer constant begins with the letters 0x or 0X, it is hexadecimal. If it begins with the digit 0, it is octal. Otherwise, it is assumed to be decimal.
The following lines are equivalent:
0x1C /* = Hexadecimal representation for decimal 28 */
034 /* = Octal representation for decimal 28 */
No white-space characters can separate the digits of an integer constant. These examples show valid decimal, octal, and hexadecimal constants.
/* Decimal Constants */
10
132
32179
/* Octal Constants */
012
0204
076663
/* Hexadecimal Constants */
0xa or 0xA
0x84
0x7dB3 or 0X7DB3
鼠 2011-03-16
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[Quote=引用 2 楼 wangw89 的回复:]
还有，在程序中的“0L”代表多大的数值？
[/Quote]
类型为 long，值是 0。
还有，在程序中的“0L”代表多大的数值？
[/Quote]
类型为 long，值是 0。
wangw89 2011-03-16
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还有，在程序中的“0L”代表多大的数值？
鼠 2011-03-16
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是在用 MinGW 么？
记得这是从前 WinNT 试图实现 POSIX 导致的历史遗留问题……
记得这是从前 WinNT 试图实现 POSIX 导致的历史遗留问题……
