isfinite(3M)isfinite(3M)NAMEisfinite() - floating-point finiteness macro
The macro determines whether its argument has a finite value (zero,
denormalized, or normalized, and not infinite or NaN). The argument
must be of floating type, and classification is based on the type of
the argument. For HP Integrity servers, the argument can be any float‐
ing type. For PA-RISC, the argument must be either or
The macro implements the functionality recommended by the IEEE-754
standard for floating-point arithmetic.
To use the macro, compile either with the default option or with the
and options. Make sure your program includes Link in the math library
by specifying on the compiler or linker command line.
The macro returns a nonzero value if and only if its argument has a
finite value. The macro raises no floating-point exceptions.
No errors are defined.
Make sure a value is finite before continuing operations on it:
SEE ALSOfpclassify(3M), isinf(3M), isnan(3M), isnormal(3M), signbit(3M),