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std::isnormal

性病：：正常

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

1-3%29确定给定的浮点数arg是正规的，即不是零，次正规，无限，也不是南。

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如果arg是正常的，false否则。

例

二次

#include <iostream>
#include <cmath>
#include <cfloat>
 
int main()
{
    std::cout << std::boolalpha
              << "isnormal(NaN) = " << std::isnormal(NAN) << '\n'
              << "isnormal(Inf) = " << std::isnormal(INFINITY) << '\n'
              << "isnormal(0.0) = " << std::isnormal(0.0) << '\n'
              << "isnormal(DBL_MIN/2.0) = " << std::isnormal(DBL_MIN/2.0) << '\n'
              << "isnormal(1.0) = " << std::isnormal(1.0) << '\n';
}

二次

产出：

二次

isnormal(NaN) = false
isnormal(Inf) = false
isnormal(0.0) = false
isnormal(DBL_MIN/2.0) = false
isnormal(1.0) = true

二次

另见

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

c文件为等距

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