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ISINF(3) Library Functions Manual ISINF(3)NAMEisinf-- test for infinityLIBRARYStandard C Library (libc, -lc)SYNOPSIS#include<math.h>intisinf(real-floating x);DESCRIPTIONTheisinf() macro determines whether its argument x is an infinity (positive or negative). An argument represented in a format wider than its semantic type is converted to its semantic type first. The determination is then based on the type of the argument.IEEE754It is determined whether the value of x is an infinity.VAXInfinities are not supported.RETURNVALUESTheisinf() macro returns a non-zero value if the value of x is an infinity. Otherwise 0 is returned.SEEALSOfpclassify(3), isfinite(3), isinff(3), isnan(3), isnanf(3), isnormal(3), math(3), signbit(3) IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.STANDARDSTheisinf() macro conforms to ISO/IEC 9899:1999 (``ISO C99''). NetBSD 7.1.2 March 5, 2004 NetBSD 7.1.2