只能说转英伦英里，什么加仑balbala至今没搞懂，这题和C Primer Plus简直太像了。–4.11

CH02 Code Answer 1:

#include <iostream>

const short Inch = 12;

int main()
{
	using namespace std;
	
	short height;
	
	cout << "Plz enter your height:___\b\b\b";
	cin >> height;
	cout << "Convert answer: " << height / Inch << "ft " << height % Inch << "inch!";
	
	return 0;	
} 

CH02 Code Answer 2:

#include <iostream>

const short Inch = 12;
const float Bang = 2.2;
const float Meter = 0.0254;

int main()
{
	using namespace std;
	
	float foot, inch, weight;
	
	cout << "Plz enter your foot:___\b\b\b";
	cin >> foot;
	cout << "Plz enter your inch:___\b\b\b";
	cin >> inch;
	cout << "Plz enter your weight:___\b\b\b";
	cin >> weight;
	cout << "Your BMI is " << (weight / Bang) / ((foot * Inch + inch) * Meter);
	
	return 0;
}

CH02 Code Answer 3:

#include <iostream>

const short Degree = 60;
const short Minute = 60;

int main()
{
	using namespace std;
	
	float degrees, minutes, seconds;
	
	cout << "Enter a latitude in degrees, minutes, and seconds:" << endl;
	cout << "First, enter the degrees: ";
	cin >> degrees;
	cout << "Next, enter the minuts of arc: ";
	cin >> minutes;
	cout << "Finally, enter the seconds of arc: ";
	cin >> seconds;
	cout << degrees << "degrees, " << minutes << "minutes, " << seconds << "seconds = " 
			<< degrees + minutes / Degree + seconds / Degree / Minute << " degrees";
		
	return 0;
}

CH02 Code Answer 4:

#include <iostream>

const short Day = 24;
const short Hour = 60;
const short Minute = 60;

int main()
{
	using namespace std;
	
	long inputSeconds;
	int days, hours, minutes, seconds;
	
	cout << "Enter the number of seconds: ";
	cin >> inputSeconds;
	
	days = inputSeconds / Minute / Hour / Day;
	hours = (inputSeconds - days * Day * Hour * Minute) / Minute / Hour;
	minutes = ((inputSeconds - days * Day * Hour * Minute) - hours * Minute * Hour) / Minute;
	seconds = ((inputSeconds - days * Day * Hour * Minute) - hours * Minute * Hour) - minutes * Minute;
	cout << inputSeconds << " seconds = " << days << " days, " 
			<< hours << " hours, " 
				<< minutes << " minutes, " 
					<< seconds << " seconds!"; 
	
	return 0;
}

CH02 Code Answer 5:

#include <iostream>

int main()
{
	using namespace std;
	
	long long worldPopulation, population;
	
	cout << "Enter the world's population: ";
	cin >> worldPopulation;
	cout << "Enter population of the China: ";
	cin >> population;
	cout << "The population of the China is " << double(population) / double(worldPopulation) * 100 << "% of the world population!";
	
	return 0;
}

CH02 Code Answer 6:

#include <iostream> 

int main()
{
	using namespace std;
	
	float miles, calons;
	
	cout << "Enter your miles: ";
	cin >> miles;
	cout << "Enter your calons: ";
	cin >> calons;
	cout << "Your drive " << miles / calons << " miles using 1 calon gas";
	
	return 0;
}

// 求 many miles using  1 calon 
// miles / calon 即可求多少英里1加仑（距离除燃料） 

// 求 many litros using 100 kilometers  
// litros / kilometers 即可多少升一百公里（燃料除距离） 

CH02 Code Answer 7:

#include <iostream>

const float Miles = 62.14;
const float Calons = 3.875;

int main()
{
	using namespace std;
	
	float kilometers, litros;
	
	cout << "Enter your kilometers: ";
	cin >> kilometers;
	cout << "Enter your litros: ";
	cin >> litros;
	// 转换为整形这个方法比int()更加严格 
	cout << "Your dirve is " << static_cast<int>((kilometers / 100 * Miles) / (litros / Calons)) << " litros using 100 kilometers!";
		
	return 0;
}
// 求多少英里1加仑，输入x升（3.875升 = 1加仑）, y公里（100公里 = 62.14英里） 
// y / 100 * 62.14 即英里
// x / 3.875 即加仑
// 所以公式为  (y / 100 * 62.14) / (x / 3.875)

体育课上完回来就搞清楚了！！–4.11