C++ Primer Plus 第六版第三章课后编程练习答案

我会带着你远行 2023-06-18 12:54 34阅读 0赞

#include <iostream>
    int main()
    {
        using namespace std;
        cout << "Enter height:_____\b\b\b\b\b";
        //题目要求使用下划线字符来指示输入位置，就是要求你打出下划线，然后使用“\b”字符来使光标回退到下划线的最前端
        int h;
        cin >> h;
        const int In_per_Ft = 12;
        //const常量: 其值在程序运行的过程中不会发生改变,但是定义常量的时候可以设置初始值
        int ft,in;
        ft = h / In_per_Ft;
        in = h % In_per_Ft;
        cout << "Ft = "<<ft<<" ,In = "<<in<<endl;
        return 0;
    }

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#include <iostream>
    int main()
    {
            using namespace std;
            cout << "Enter  feet: ____\b\b\b\b";
            int feet;
            cin >> feet;
            cout << "Enter  inch: ____\b\b\b\b";
            int inch;
            cin >> inch;
            cout << "Enter  weight: ____\b\b\b\b";
            int weight;
            cin >> weight;
            cout << "Feet: " << feet << " ,Inch: " << inch << " ,Weight: " << weight << endl;
            int height_inch;
            const int In_per_Ft = 12;
            height_inch = feet * In_per_Ft + inch;
            const double In_per_M = 0.0254;
            double height_meter;
            height_meter = height_inch * In_per_M;
            const double Kg_per_p = 2.2;
            double weight_kg;
            weight_kg = weight / Kg_per_p;
            cout << "That means you are " << height_meter << " meters height and " << weight_kg << " kilograms weight." << endl;
            double BMI;
            BMI = weight_kg / (height_meter * height_meter);
            cout << "And your BMI is " << BMI << endl;
        return 0;
    }

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//以度为输出，就是把分和秒都换算为度
    #include <iostream>
    
    int main()
    {
            using namespace std;
    
            cout << "Enter a latitude in degrees, minutes, and seconds:" << endl;
            cout << "First, enter the degrees:__\b\b";
            int degree;
            cin >> degree;
            cout << "Next, enter the minutes:__\b\b";
            int minute;
            cin >> minute;
            cout << "Finally, enter the seconds:__\b\b";
            int second;
            cin >> second;
    
            const int Count = 60;
            double latitude;
    // 错误  latitude = degree + double (minute/Count) + double (second/Count/Count);  注：minute/Count直接得到的是int，再加double也没意义了
            latitude = degree + double (minute)/Count + double (second)/Count/Count;
            cout << degree << " degrees, " << minute << " minute, " << second << " seconds = " << latitude << " degrees" << endl;
        return 0;
    }

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#include <iostream>
    int main()
    {
        using namespace std;
        cout << "Enter the number of seconds: ";
        long second;
        cin >> second;
        const int Min_per_sec = 60;
        const int H_per_min = 60;
        const int D_per_h = 24;
        int s, d, h, min;
        s = second % Min_per_sec;
        int convert;
        convert = second / Min_per_sec;
        min = convert % H_per_min;
        convert = convert / H_per_min;
        h = convert % D_per_h;
        d = convert / D_per_h;
        cout << second << " seconds = " << d << " days, " << h << " hours, " << min << " minutes, " << s << " seconds" << endl;
        return 0;
    }

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#include <iostream>
    
    int main()
    {
        using namespace std;
    
        cout << "Enter the world's population:__________\b\b\b\b\b\b\b\b\b\b";
        long long wp;
        cin >> wp;
        cout << "Enter the population of the US:__________\b\b\b\b\b\b\b\b\b\b";
        long long usp;
        cin >> usp;
        double percent;
    // 亦可   percent = double (usp) /  wp * 100;
        percent = double (usp) / double (wp) * 100;
        cout << "The population of the US is " << percent << "% of the world population." << endl;
        return 0;
    }

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#include<iostream>
    
    int main() {
        using namespace std;
        float miles, gallons;
        cout << "nter the distance(mile): ";
        cin >> miles;
        cout << "Please enter the gasoline amount(gallon): ";
        cin >> gallons;
        cout << "Wasting a gallon gasoline run " << miles / gallons << " miles.\n";
        int number;
        cout << "Do you want to know how much oil is consumed per 100 kilometers?"
                " if you want, please enter 1: ";
        cin >> number;
        if (number == 1) {
            float kilometers, liter;
            cout << "Please enter the distance(kilometer):";
            cin >> kilometers;
            cout << "Please enter the gasoline amount(liter):";
            cin >> liter;
            cout << "Wasting gasoline per 100 kilometers is " << liter / kilometers * 100
                 << " liters." << endl;
        }
        return 0;
    }

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#include <iostream>
    
    int main()
    {
            using namespace std;
    
            cout << "Enter  kilometers:";
            float kilometer;
            cin >> kilometer;
            cout << "Enetr your litros:";
            float litro;
            cin >> litro;
            float eux;
            eux = litro / (kilometer / 100);
            cout << "Every 100 kilometers cost " << eux << " litros gas in Europe." << endl;
            const float Mile_per_100kilometers = 62.14;
            float mile;
            mile = (kilometer / 100) * Mile_per_100kilometers;
            const float Calon_per_litro = 3.875;
            float calon;
            calon = litro / Calon_per_litro;
            float usx;
            usx = mile / calon;
            cout << "That means you drive " << usx << " miles  using 1 calon gas in the US." << endl;
            cout << eux << "/100km = " << usx << "mpg" << endl;
    
        return 0;
    }

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