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| ISINF(3) | Linux Programmer's Manual | ISINF(3) |
NAME¶
isinf, isnan, finite - test for infinity or not-a-number (NaN)SYNOPSIS¶
#include <math.h> int isinf(double value); int isnan(double value); int finite(double value);
DESCRIPTION¶
The isinf() function returns -1 if value represents negative infinity, 1 if value represents positive infinity, and 0 otherwise.The isnan() function returns a non-zero value if value is "not-a-number" (NaN), and 0 otherwise.
The finite() function returns a non-zero value if value is neither infinite nor a "not-a-number" (NaN) value, and 0 otherwise.
CONFORMING TO¶
BSD 4.3| June 2, 1993 | GNU |