std::isinf
From cppreference.com
Defined in header
<cmath>
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bool isinf( float arg );
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(1) | (since C++11) |
bool isinf( double arg );
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(2) | (since C++11) |
bool isinf( long double arg );
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(3) | (since C++11) |
bool isinf( Integral arg );
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(4) | (since C++11) |
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
from
argument of any integral type. Equivalent to (2) (the argument is cast to double).
Contents |
[edit] Parameters
arg | - | floating point value |
[edit] Return value
true if arg
is infinite, false otherwise
[edit] 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
[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 has finite value (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 isinf
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