ISINF Section: Linux Programmer's Manual (3) Updated: June 2, 2025 Index   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   Index NAME SYNOPSIS DESCRIPTION CONFORMING TO This document was created by using the manual pages. Time: 11:58:03 GMT, March 24, 2025