# isinf(3) [osx man page]

FPCLASSIFY(3) BSD Library Functions Manual FPCLASSIFY(3)NAME

fpclassify, isfinite, isinf, isnan, isnormalclassify a floating-point number--LIBRARY

Math Library (libm, -lm)SYNOPSIS

#include <math.h> int fpclassify(real-floating x); int isfinite(real-floating x); int isinf(real-floating x); int isnan(real-floating x); int isnormal(real-floating x);DESCRIPTION

The fpclassify() macro takes an argument of x and returns one of the following manifest constants. FP_INFINITE Indicates that x is an infinite number. FP_NAN Indicates that x is not a number (NaN). FP_NORMAL Indicates that x is a normalized number. FP_SUBNORMAL Indicates that x is a denormalized number. FP_ZERO Indicates that x is zero (0 or -0). The isfinite() macro returns a non-zero value if and only if its argument has a finite (zero, subnormal, or normal) value. The isinf(), isnan(), and isnormal() macros return non-zero if and only if x is an infinity, NaN, or a non-zero normalized number, respectively.SEE ALSO

isgreater(3), math(3), signbit(3)STANDARDS

The fpclassify(), isfinite(), isinf(), isnan(), and isnormal() macros conform to ISO/IEC 9899:1999 (``ISO C99'').HISTORY

3BSD introduced isinf() and isnan() functions, which accepted double arguments; these have been superseded by the macros described above.BSD

December 11, 2006 BSD

## Check Out this Related Man Page

NAME

fpclassify, isfinite, isinf, isnan, isnormalclassify a floating-point number--LIBRARY

Math Library (libm, -lm)SYNOPSIS

#include <math.h> int fpclassify(real-floating x); int isfinite(real-floating x); int isinf(real-floating x); int isnan(real-floating x); int isnormal(real-floating x);DESCRIPTION

The fpclassify() macro takes an argument of x and returns one of the following manifest constants. FP_INFINITE Indicates that x is an infinite number. FP_NAN Indicates that x is not a number (NaN). FP_NORMAL Indicates that x is a normalized number. FP_SUBNORMAL Indicates that x is a denormalized number. FP_ZERO Indicates that x is zero (0 or -0). The isfinite() macro returns a non-zero value if and only if its argument has a finite (zero, subnormal, or normal) value. The isinf(), isnan(), and isnormal() macros return non-zero if and only if x is an infinity, NaN, or a non-zero normalized number, respectively.SEE ALSO

isgreater(3), math(3), signbit(3)STANDARDS

The fpclassify(), isfinite(), isinf(), isnan(), and isnormal() macros conform to ISO/IEC 9899:1999 (``ISO C99'').HISTORY

3BSD introduced isinf() and isnan() functions, which accepted double arguments; these have been superseded by the macros described above.BSD

December 11, 2006 BSD