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关于C++中头文件<climits>

2014-09-02 13:23 567 查看
头文件<climits> 里面定义了各种datatype 的极限值。 常常我们需要使用这个极限值对数组， 变量等进行初始化。 该头文件下定义的宏如下：



Macro constants

nameexpressesvalue*
CHAR_BITNumber of bits in a 
char
object (byte)
8
or greater*
SCHAR_MINMinimum value for an object of type 
signed char
-127
(
-27+1
) or less*
SCHAR_MAXMaximum value for an object of type 
signed char
127
(
27-1
) or greater*
UCHAR_MAXMaximum value for an object of type 
unsigned char
255
(
28-1
) or greater*
CHAR_MINMinimum value for an object of type 
char
either SCHAR_MIN or 
0
CHAR_MAXMaximum value for an object of type 
char
either SCHAR_MAX or UCHAR_MAX
MB_LEN_MAXMaximum number of bytes in a multibyte character, for any locale
1
or greater*
SHRT_MINMinimum value for an object of type 
short int
-32767
(
-215+1
) or less*
SHRT_MAXMaximum value for an object of type 
short int
32767
(
215-1
) or greater*
USHRT_MAXMaximum value for an object of type 
unsigned short int
65535
(
216-1
) or greater*
INT_MINMinimum value for an object of type 
int
-32767
(
-215+1
) or less*
INT_MAXMaximum value for an object of type 
int
32767
(
215-1
) or greater*
UINT_MAXMaximum value for an object of type 
unsigned int
65535
(
216-1
) or greater*
LONG_MINMinimum value for an object of type 
long int
-2147483647
(
-231+1
) or less*
LONG_MAXMaximum value for an object of type 
long int
2147483647
(
231-1
) or greater*
ULONG_MAXMaximum value for an object of type 
unsigned long int
4294967295
(
232-1
) or greater*
LLONG_MINMinimum value for an object of type 
long long int
-9223372036854775807
(
-263+1
) or less*
LLONG_MAXMaximum value for an object of type 
long long int
9223372036854775807
(
263-1
) or greater*
ULLONG_MAXMaximum value for an object of type 
unsigned long long int
18446744073709551615
(
264-1
) or greater*
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