| Defined in header <cmath> | ||
|---|---|---|
bool isfinite( float arg ); | (1) | (since C++11) |
bool isfinite( double arg ); | (2) | (since C++11) |
bool isfinite( long double arg ); | (3) | (since C++11) |
bool isfinite( Integral arg ); | (4) | (since C++11) |
1-3) Determines if the given floating point number
arg has finite value i.e. it is normal, subnormal or zero, but not infinite or NaN. 4) A set of overloads or a function template accepting the
from argument of any integral type. Equivalent to (2) (the argument is cast to double). Parameters
| arg | - | floating point value |
Return value
true value if arg has finite value, false if arg is infinite or NaN.
Examples
#include <iostream>
#include <cmath>
#include <cfloat>
int main()
{
std::cout << std::boolalpha
<< "isfinite(NaN) = " << std::isfinite(NAN) << '\n'
<< "isfinite(Inf) = " << std::isfinite(INFINITY) << '\n'
<< "isfinite(0.0) = " << std::isfinite(0.0) << '\n'
<< "isfinite(exp(800)) = " << std::isfinite(std::exp(800)) << '\n'
<< "isfinite(DBL_MIN/2.0) = " << std::isfinite(DBL_MIN/2.0) << '\n';
}Output:
isfinite(NaN) = false isfinite(Inf) = false isfinite(0.0) = true isfinite(exp(800)) = false isfinite(DBL_MIN/2.0) = true
See also
| (C++11) | categorizes the given floating point value (function) |
| (C++11) | checks if the given number is infinite (function) |
| (C++11) | checks if the given number is NaN (function) |
| (C++11) | checks if the given number is normal (function) |
C documentation for isfinite | |
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