| Defined in header <cmath> | ||||
|---|---|---|---|---|
| (1) | (since C++11) | ||
| (2) | (since C++11) | ||
| (3) | (since C++11) | ||
| (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). Parameters
| arg | - | floating point value |
Return value
true if arg is infinite, false otherwise.
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 | #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:
1 2 3 4 5 | isinf(NaN) = falseisinf(Inf) = trueisinf(0.0) = falseisinf(exp(800)) = trueisinf(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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