std::isfinite
From cppreference.com
Defined in header
<cmath>
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bool isfinite( float arg );
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(1) | (since C++11) |
bool isfinite( double arg );
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(2) | (since C++11) |
bool isfinite( long double arg );
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(3) | (since C++11) |
bool isfinite( Integral arg );
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(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).
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[edit] Parameters
arg | - | floating point value |
[edit] Return value
true value if arg
has finite value, false if arg
is infinite or NaN
[edit] Examples
Run this code
#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
[edit] See also
(C++11)
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categorizes the given floating point value (function) |
(C++11)
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checks if the given number is infinite (function) |
(C++11)
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checks if the given number is NaN (function) |
(C++11)
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checks if the given number is normal (function) |
C documentation for isfinite
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