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2.6 locale.h 
The limits header defines the characteristics of variable types.
The following values are defined with the #define
directive. These values are
implementationspecific, but may not be any lower than what is given here.
CHAR_BIT 8

Number of bits in a byte. 
SCHAR_MIN 127

Minimum value for a signed char. 
SCHAR_MAX +127

Maximum value for a signed char. 
UCHAR_MAX 255

Maximum value for an unsigned char. 
CHAR_MIN

These define the minimum and maximum values for a char. If a char is being
represented as a signed integer, then their values are the same as the signed char (SCHAR )
values. Otherwise CHAR_MIN is 0 and CHAR_MAX is the same as UCHAR_MAX .

MB_LEN_MAX 1

Maximum number of bytes in a multibyte character. 
SHRT_MIN 32767

Minimum value for a short int. 
SHRT_MAX +32767

Maximum value for a short int. 
USHRT_MAX 65535

Maximum value for an unsigned short int. 
INT_MIN 32767

Minimum value for an int. 
INT_MAX +32767

Maximum value for an int. 
UINT_MAX 65535

Maximum value for an unsigned int. 
LONG_MIN 2147483647

Minimum value for a long int. 
LONG_MAX +2147483647

Maximum value for a long int. 
ULONG_MAX 4294967295

Maximum value for an unsigned long int. 
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