std::isinf
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
#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
|
(C++11)
|
categorizes the given floating-point value (function) |
|
(C++11)
|
checks if the given number has finite value (function) |
|
(C++11)
|
checks if the given number is NaN (function) |
|
(C++11)
|
checks if the given number is normal (function) |
C documentation for isinf |
|
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