C++ 浮点数与0比较

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最新推荐文章于 2025-03-26 20:22:17 发布

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分类专栏： C++ 文章标签：浮点数与0

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#include <iostream>
#include <type_traits>
#include <limits>

template <typename T, typename = typename std::enable_if<std::is_floating_point<T>::value>::type>
bool IsEqualZero(T value)
{
    if (value > -std::numeric_limits<T>::epsilon() && value < std::numeric_limits<T>::epsilon())
    {
        std::cout << "value:" << value << ", epsilon:" << std::numeric_limits<T>::epsilon() << ", true" << std::endl;
        return true;
    }
    std::cout << "value:" << value << ", epsilon:" << std::numeric_limits<T>::epsilon() << ", false" << std::endl;
    return false;
}

int main()
{
    IsEqualZero<float>(0.000000119210);
    IsEqualZero<float>(0.0000001);
    IsEqualZero<float>(0.000001);
    IsEqualZero<float>(0.00001);
    IsEqualZero<float>(0.0001);
    IsEqualZero<float>(0.001);
    IsEqualZero<float>(0.01);
    IsEqualZero<float>(0.1);

    IsEqualZero<double>(0.000000000000000222047);
    IsEqualZero<double>(0.000000000000000222046);

    IsEqualZero<double>(0.000000000000000222045);
    IsEqualZero<double>(0.00000000000000001);
    IsEqualZero<double>(0.0000001);
    IsEqualZero<double>(0.000001);
    IsEqualZero<double>(0.00001);
    IsEqualZero<double>(0.0001);
    IsEqualZero<double>(0.001);
    IsEqualZero<double>(0.01);
    IsEqualZero<double>(0.1);

    return 0;
}