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ISINF(3) Library Functions Manual ISINF(3) NAME isinf - test for infinity LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <math.h> int isinf(real-floating x); DESCRIPTION The isinf() 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. IEEE 754 It is determined whether the value of x is an infinity. VAX Infinities are not supported. RETURN VALUES The isinf() macro returns a non-zero value if the value of x is an infinity. Otherwise 0 is returned. SEE ALSO fpclassify(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. STANDARDS The isinf() macro conforms to ISO/IEC 9899:1999 ("ISO C99"). NetBSD 8.0 March 5, 2004 NetBSD 8.0