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Manpages ISINFSection: Linux Programmer's Manual (3 )Updated: 1993-06-02 Index Return to Main Contents NAMEisinf, 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); DESCRIPTIONThe 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 TOBSD 4.3
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