isfinite() — Determines if its argument has a finite value
Standards
Standards / Extensions | C or C++ | Dependencies |
---|---|---|
C99 |
both |
z/OS V1R8 |
Format
#define _ISOC99_SOURCE
#include <math.h>
int isfinite(real-floating x);
#define __STDC_WANT_DEC_FP__
#include <math.h>
int isfinite(real-floating x); /* C only */
int isfinite(decimal-floating x); /*C only */
bool isfinite(real-floating x); /* C++ only */
#define _TR1_C99
#include <math.h>
bool isfinite(real-floating x); /* C++ only */
General description
The isfinite() macro or function template determines if its argument has a finite value.
Function | Hex | IEEE |
---|---|---|
isfinite | X | X |
Notes:
- To use IEEE decimal floating-point, the hardware must have the Decimal Floating-Point Facility installed.
- This function works in IEEE decimal floating-point format. See "IEEE Decimal Floating-Point" for more information.
Returned value
The isfinite() macro returns 1 if and only if its argument value is finite, else returns 0. The C++ function template returns true if and only if its argument value is finite, else returns false.
Special behavior in hex: The isfinite() macro always returns 1. The C++ function template always returns true.