C标准库——limitis.h

这个标准库定义了各种常量表示整型数据类型的能够表示数据的范围。

 

name	expresses	min. magnitude*
CHAR_BIT	Number of bits for a charobject (byte)	8
SCHAR_MIN	Minimum value for an object of type signed char	-127
SCHAR_MAX	Maximum value for an object of type signed char	127
UCHAR_MAX	Maximum value for an object of type unsigned char	255
CHAR_MIN	Minimum value for an object of type char	either SCHAR_MIN or 0
CHAR_MAX	Maximum value for an object of type char	either SCHAR_MAX or UCHAR_MAX
MB_LEN_MAX	Maximum number of bytes in a multibyte character, for any locale	1
SHRT_MIN	Minimum value for an object of type short int	-32767
SHRT_MAX	Maximum value for an object of type short int	32767
USHRT_MAX	Maximum value for an object of type unsigned short int	65535
INT_MIN	Minimum value for an object of type int	-32767
INT_MAX	Maximum value for an object of type int	32767
UINT_MAX	Maximum value for an object of type unsigned short int	65535
LONG_MIN	Minimum value for an object of type long int	-2147483647
LONG_MAX	Maximum value for an object of type long int	2147483647
ULONG_MAX	Maximum value for an object of type unsigned int	4294967295

示例：（mac air x86_64、Xcode）

#include <iostream>
#include <climits>

using namespace std;
int main(){
    cout<<CHAR_BIT<<endl;
    cout<<SCHAR_MIN<<endl;
    cout<<SCHAR_MAX<<endl;
    cout<<UCHAR_MAX<<endl;
    cout<<CHAR_MIN<<endl;
    cout<<CHAR_MAX<<endl;
    cout<<MB_LEN_MAX<<endl;
    cout<<SHRT_MIN<<endl;
    cout<<SHRT_MAX<<endl;
    cout<<USHRT_MAX<<endl;
    cout<<INT_MIN<<endl;
    cout<<INT_MAX<<endl;
    cout<<UINT_MAX<<endl;
    cout<<LONG_BIT<<endl;
    cout<<LONG_MIN<<endl;
    cout<<LONG_MAX<<endl;
    cout<<ULONG_MAX<<endl;
}

结果：