NAME

limits − header files for implementation-specific constants

SYNTAX

#include < limits.h>
#include < float.h>

DESCRIPTION

The header file < limits.h> specifies the sizes of intergral types as required by the proposed ANSI C standard. The header file < float.h> specifies the characteristics of floating types as required by the proposed ANSI C standard. The constants that refer to long doubles that should appear in < float.h> are not specified because MIPS does not implement long doubles.

The file < limits.h> contains the following:

#define  CHAR_BIT  8         /* # of bits in a ‘char’ */
#define  SCHAR_MIN (-128)    /* min integer value of a ‘signed char’ */
#define  SCHAR_MAX (+127)    /* max integer value of a ‘signed char’ */
#define  UCHAR_MAX 255       /* max integer value of ‘unsigned char’ */
#define  CHAR_MIN  (-128)    /* min integer value of a ‘char’ */
#define  CHAR_MAX  (+127)    /* max integer value of a ‘char’ */
#define  SHRT_MIN  (-32768)  /* min decimal value of a ‘short’ */
#define  SHRT_MAX  (+32767)  /* max decimal value of a ‘short’ */
#define  USHRT_MAX 65535     /* max decimal value of ‘unsigned short’ */
#define  INT_MIN   (-2147483648) /* min decimal value of an ‘int’ */
#define  INT_MAX   (+2147483647) /* max decimal value of a ‘int’ */
#define  UINT_MAX  4294967295  /* max decimal value of ‘unsigned int’ */
#define  LONG_MIN  (-2147483648) /* min decimal value of a ‘long’ */
#define  LONG_MAX  (+2147483647) /* max decimal value of a ‘long’ */
#define  ULONG_MAX 4294967295  /* max decimal value of ‘unsigned long’ */
#define  USI_MAX  4294967295    /* max decimal value of ‘unsigned’ */
#define  WORD_BIT  32            /* # of bits in a “word” or ‘int’ */

The file < float.h> contains the following:

#define  FLT_RADIX  2 /* radix of exponent representation */
#define  FLT_ROUNDS  1 /* addition rounds (>0 implementation-defined) */
/* number of base-FLT_RADIX digits in the floating point mantissa */
#define  FLT_MANT_DIG  24
#define  DBL_MANT_DIG  53
/* minimum positive floating-point number x such
that 1.0 + x ≠ 1.0 */
#define  FLT_EPSILON  1.19209290e-07
#define  DBL_EPSILON  2.2204460492503131e-16
/* number of decimal digits of precision */
#define  FLT_DIG  6
#define  DBL_DIG  15
/* minimum negitive integer such that FLT_RADIX raised to that
power minus 1 is a normalized floating point number */
#define  FLT_MIN_EXP  -125
#define  DBL_MIN_EXP  -1021
/* minimum normalized positive floating-point number */
#define  FLT_MIN  1.17549435e-38
#define  DBL_MIN  2.225073858507201e-308
/* minimum negative integer such that 10 raised to that
power is in the range of normalized floating-point numbers */
#define  FLT_MIN_10_EXP  -37
#define  DBL_MIN_10_EXP  -307
/* maximum integer such that FLT_RADIX raised to that power
minus 1 is a representable finite floating-point number */
#define  FLT_MAX_EXP  +128
#define  DBL_MAX_EXP  +1024
/* maximum representable finite floating-point number */
#define  FLT_MAX  3.40282347e+38
#define  DBL_MAX  1.797693134862316e+308
/* maximum integer such that 10 raised to that power is
in the range of representable finite floating-point numbers */
#define  FLT_MAX_10_EXP  38
#define  DBL_MAX_10_EXP  308

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