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ISINFF(3) Library Functions Manual ISINFF(3)

isinff, isnanf — test for infinity or not-a-number

library “libm”

#include <math.h>

int
isinff(float);

int
isnanf(float);

The () function returns 1 if the number is “infinity”, otherwise 0.

The () function returns 1 if the number is “not-a-number”, otherwise 0.

isinf(3), isnan(3), math(3)

IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.

Neither the VAX nor the Tahoe floating point have distinguished values for either infinity or not-a-number. These routines always return 0 on those architectures.

August 16, 1999 NetBSD-9.2