C++入门经典第二章编程练习

千岁忧

于 2018-08-20 21:05:47 发布

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分类专栏： C++入门经典学习

本文链接：https://blog.youkuaiyun.com/qq_31985845/article/details/81877820

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1

#include "pch.h"
#include <iostream>
using namespace std;

int main()
{
    while (1)
    {
        const double ton = 35273.92;
        double a;
        cin >> a;
        cout << a / ton<<endl;
        cout << ton / a<<endl;
    }
}

2

#include "pch.h"
#include <iostream>
using namespace std;

int main()
{
    double n;
    cin >> n;
    double g = n/2;
    double r = n / g;
    while (((g+r)/(2*g))<0.99)
    {
        r = n / g;
        g = (g + r) / 2;
    }
    cout << g;
}

3

#include "pch.h"
#include <iostream>
using namespace std;

int main()
{
    double mph;
    cin >> mph;


    cout << "一公里要" << static_cast<int>(60 / mph) << "分钟" << ((60 / mph) - static_cast<int>(60 / mph)) * 60 << "秒" << endl;
}