[学习笔记]C++17学习第4天

mdl2999_52pj

# include <iostream>
// c++17
using namespace std;

int main()
{
    //类型转换
    double v1 {10.9};
    double v2 {15.9};

    int t1 {static_cast<int>(v1) + static_cast<int>(v2)};
    int t2 {static_cast<int>(v1+v2)};

    cout << v1 << ", " << v1 << ", " << t1 << ", " << t2 ;
}

mdl2999_52pj

# include <iostream>
# include <limits>
//c++17
using namespace std;

int main()
{
    cout << "The range for type short is from " << std::numeric_limits<short>::min() << " to "
        <<  std::numeric_limits<short>::max() << endl;

    cout << "The range for type int is from " << std::numeric_limits<int>::min() << " to "
        <<  std::numeric_limits<int>::max() << endl;

    cout << "The range for type long is from " << std::numeric_limits<long>::min() << " to "
            <<  std::numeric_limits<long>::max() << endl;

    cout << "The range for type float is from " << std::numeric_limits<float>::min() << " to "
            <<  std::numeric_limits<float>::max() << endl;

    cout << "The range for type float is from " << std::numeric_limits<float>::lowest() << " to "
            <<  std::numeric_limits<float>::max() << endl;

    cout << "The range for type double is from " << std::numeric_limits<double>::min() << " to "
            <<  std::numeric_limits<double>::max() << endl;

    cout << "The range for type double is from " << std::numeric_limits<double>::lowest() << " to "
            <<  std::numeric_limits<double>::max() << endl;

    cout << "The range for type long double is from " << std::numeric_limits<long double>::min() << " to "
            <<  std::numeric_limits<long double>::max() << endl;

    cout << "The range for type long double is from " << std::numeric_limits<long double>::lowest() << " to "
            <<  std::numeric_limits<long double>::max() << endl;

}

she383536296

可以，希望你有耐心坚持下去

mdl2999_52pj

# include <iostream>
//c++17
using namespace std;

int main()
{
    //字符变量
    char ch{'A'};
    ++ch;
    cout << "ch is '" << ch << "' which is code " << hex << showbase << static_cast<int>(ch) << endl; 
}

mdl2999_52pj

# include <iostream>
//c++17
using namespace std;

int main()
{
    //auto 单值初始化 
    auto m{10}; // int
    auto n{200UL}; // unsigned long int
    auto pi{3.14159}; // double

    cout << m << n << pi << endl;

    auto v1 = {3.14159}; // std::initializer_list<double>
    auto v2 = {3,4,5}; // std::initializer_list<int>

    for (auto x:v1)
        cout << x ;
    cout << endl;
    for (auto x:v2)
        cout << x; 
    cout << endl;
}

致远英才

加油！好好学习天天向上

alan3258

请问用的什么IDE开发的？

mdl2999_52pj

alan3258 发表于 2021-5-16 11:59
请问用的什么IDE开发的？

red panda dev c++