runoob_32_cfloat

/*
 * @Author: by777
 * @Date: 2025-03-25 09:08:23
 * @LastEditors: by777
 * @LastEditTime: 2025-03-25 09:24:49
 * @FilePath: /cxx_stl/runoob_32.cpp
 * @Description: https://www.runoob.com/cplusplus/cpp-libs-cfloat.html
 * 
 * Copyright (c) 2025 by by777, All Rights Reserved. 
 */
#include <iostream>
#include <cfloat>
// C++ 标准库中的一个头文件，用于定义浮点数相关的宏和常量。
// 这些宏和常量提供了关于浮点数表示的精度、范围等信息，
// 主要来自 C 标准库的 <float.h> 头文件
using namespace std;
int main(int argc, const char** argv) {
    std::cout << "float:\n";
    std::cout << "Min: " << FLT_MIN << '\n';
    std::cout << "Max: " << FLT_MAX << '\n';
    std::cout << "Epsilon: " << FLT_EPSILON << '\n';
    std::cout << "Digits: " << FLT_DIG << '\n';

    // 输出 double 类型的范围和精度
    std::cout << "\ndouble:\n";
    std::cout << "Min: " << DBL_MIN << '\n';
    std::cout << "Max: " << DBL_MAX << '\n';
    std::cout << "Epsilon: " << DBL_EPSILON << '\n';
    std::cout << "Digits: " << DBL_DIG << '\n';

    // 输出 long double 类型的范围和精度
    std::cout << "\nlong double:\n";
    std::cout << "Min: " << LDBL_MIN << '\n';
    std::cout << "Max: " << LDBL_MAX << '\n';
    std::cout << "Epsilon: " << LDBL_EPSILON << '\n';
    std::cout << "Digits: " << LDBL_DIG << '\n';
    return 0;
}