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std::isfinite(3) C++ Standard Libary std::isfinite(3) NAME std::isfinite - std::isfinite Synopsis Defined in header <cmath> bool isfinite( float arg ); (1) (since C++11) (constexpr since C++23) bool isfinite( double arg ); (2) (since C++11) (constexpr since C++23) bool isfinite( long double arg ); (3) (since C++11) (constexpr since C++23) bool isfinite( IntegralType arg ); (4) (since C++11) (constexpr since C++23) 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 arg argu- ment of any integral type. Equivalent to (2) (the argument is cast to double). Parameters arg - floating point value Return value true if arg has finite value, false otherwise 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::isfi- nite(std::exp(800)) << '\n' << "isfinite(DBL_MIN/2.0) = " << std::isfi- nite(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 fpclassify categorizes the given floating-point value (C++11) (function) isinf checks if the given number is infinite (C++11) (function) isnan checks if the given number is NaN (C++11) (function) isnormal checks if the given number is normal (C++11) (function) http://cppreference.com 2022.07.31 std::isfinite(3)
NAME | Synopsis | Parameters | Return value | Examples | Output: | See also
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