table of contents
std::isinf(3) | C++ Standard Libary | std::isinf(3) |
NAME¶
std::isinf - std::isinf
Synopsis¶
Defined in header <cmath>
bool isinf( float arg ); (1) (since C++11)
(constexpr since C++23)
bool isinf( double arg ); (2) (since C++11)
(constexpr since C++23)
bool isinf( long double arg ); (3) (since C++11)
(constexpr since C++23)
bool isinf( IntegralType arg ); (4) (since C++11)
(constexpr since C++23)
1-3) Determines if the given floating-point number arg is a positive or
negative
infinity.
4) A set of overloads or a function template accepting the arg argument of
any
integral type. Equivalent to (2) (the argument is cast to double).
Parameters¶
arg - floating point value
Return value¶
true if arg is infinite, false otherwise
Example¶
// Run this code
#include <iostream>
#include <cmath>
#include <cfloat>
int main()
{
std::cout << std::boolalpha
<< "isinf(NaN) = " << std::isinf(NAN) << '\n'
<< "isinf(Inf) = " << std::isinf(INFINITY) <<
'\n'
<< "isinf(0.0) = " << std::isinf(0.0) << '\n'
<< "isinf(exp(800)) = " << std::isinf(std::exp(800))
<< '\n'
<< "isinf(DBL_MIN/2.0) = " << std::isinf(DBL_MIN/2.0)
<< '\n';
}
Output:¶
isinf(NaN) = false
isinf(Inf) = true
isinf(0.0) = false
isinf(exp(800)) = true
isinf(DBL_MIN/2.0) = false
See also¶
fpclassify categorizes the given floating-point value
(C++11) (function)
isfinite checks if the given number has finite value
(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)
2022.07.31 | http://cppreference.com |