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std::isfinite

STD：：

Defined in header ​​
bool isfinite( float arg (1)(since C++11)
bool isfinite( double arg (2)(since C++11)
bool isfinite( long double arg (3)(since C++11)
bool isfinite( Integral arg (4)(since C++11)

1-3%29确定给定的浮点数arg具有有限值，即它是正规的、次正规的或零的，但不是无限的或南的。

4%29一组重载或接受from任何论点积分型等效于%282%29%28的参数转换为double29%。

参数

arg-floating point value

返回值

true值若arg有一定的价值，false如果arg是无限的还是南的。

实例

二次

#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::isfinite(std::exp(800)) << '\n'
              << "isfinite(DBL_MIN/2.0) = " << std::isfinite(DBL_MIN/2.0) << '\n';
}

二次

产出：

二次

isfinite(NaN) = false
isfinite(Inf) = false
isfinite(0.0) = true
isfinite(exp(800)) = false
isfinite(DBL_MIN/2.0) = true

二次

另见

fpclassify (C++11)categorizes the given floating point value (function)
isinf (C++11)checks if the given number is infinite (function)
isnan (C++11)checks if the given number is NaN (function)
isnormal (C++11)checks if the given number is normal (function)

c关于isfinite的文献

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