C++ Primer Plus 第6版 课后练习 Chapter 3

// ex_3.1
#include <iostream>
using namespace std;

int main()
{
    const int FeetToInch = 12;
    int height = 0;
    cout << "Enter your height(in inch):___\b\b\b";
    cin >> height;
    int feet = height / FeetToInch;
    int inches = height % FeetToInch;
    cout << "Your height is " <<feet << " foot " << inches << " inch." << endl;


    return 0;
}

// ex_3.2
#include <iostream>
using namespace std;
const int FOOT_TO_INCHES = 12;
const double INCHES_TO_METERS = 0.0254;
const double POUNDS_TO_KILOGRAMS = 1.0 / 2.2;

int main()
{
    int height_foot = 0;
    int height_inch = 0;
    double height_meter = 0;
    double weight_pound = 0;
    double BMI = 0;

    cout << "Enter your height in foot and inch" << endl;
    cout << "Enter the foot: ";
    cin >> height_foot;
    cout << "Enter the inch: ";
    cin >> height_inch;
    cout << "Enter your weight in pounds: ";
    cin >> weight_pound;
    height_meter = INCHES_TO_METERS * (FOOT_TO_INCHES * height_foot + height_inch);
    BMI = weight_pound * POUNDS_TO_KILOGRAMS / (height_meter * height_meter);
    cout << "Your BMI is " << BMI;

    return 0;
}

// ex_3.3
#include <iostream>
using namespace std;
const double MINUTE_TO_SECOND = 60;

int main()
{
    double degrees = 0;
    double minutes = 0;
    double seconds = 0;
    double decimalFormat = 0;

    cout << "Enrer a latitude in degrees, minutes, and seconds:" << endl;
    cout << "First, enter the degrees: ";
    cin >> degrees;
    cout << "Next, enter the minutes of arc: ";
    cin >> minutes;
    cout << "Finaly, enter the seconds of arc: ";
    cin >> seconds;
    decimalFormat = degrees + (minutes + (seconds / MINUTE_TO_SECOND)) * (5.0 / 300);
    cout << int(degrees) << " degrees, " << int(minutes) << " minutes, " << int(seconds) << " seconds = " << decimalFormat << " degrees" << endl;

    return 0;
}

// ex_3.4
#include <iostream>
using namespace std;

int main()
{
    long long totSeconds;
    cout << "Enter a time in seconds: " ;
    cin >> totSeconds ;

    int currentDay = totSeconds / (24 * 60 * 60);
    int currentHours = (totSeconds - currentDay * (24 * 60 * 60)) / 3600;
    int currentMin = ((totSeconds % (60 * 60)) / 60);
    int currentSec = totSeconds % 60;

    cout << totSeconds << " seconds = " << currentDay<<" days, "
    << currentHours <<" hours, " << currentMin << " minutes, " << currentSec << " seconds" << endl;

    return 0;
}