C++ Primer Plus (第6版）编程题

第2章     开始学习 C++

//ex2.1--display your name and address
#include <iostream>
using namespace std;
int main(void)
{
	cout<<"Name:"<<"Du Yong!\n";
	cout<<"Address:"<<"甘肃定西！\n";
	return 0;
}

//ex2.2--convert the furlong units to yard units
#include <iostream>
using namespace std;
double fur2yd(double);
int main()
{
    cout<<"enter the distance measured by furlong units:";
    double fur;
    cin>>fur;
    cout<<"convert the furlong to yard"<<endl;
    double yd;
    yd=fur2yd(fur);
    cout<<fur<<" furlong is "<<yd<<" yard"<<endl;
    return 0;
}
double fur2yd(double t)
{
    return 220*t;
}

//2.3--每个函数被调用两次
#include <iostream>
using namespace std;
void mice()
{
	cout<<"Three blind mice\n";
}
void run()
{
	cout<<"See how they run\n";
}
int main()
{
	mice();
	mice();
	run();
	run();
	return 0;
}

//2.4--输入年龄，计算包含多少个月
#include <iostream>
using std::cin;
using std::cout;
using std::endl;
int Month(int m)
{
	return m*12;
}
int main()
{
	int age;
	cout<<"Enter your age:";
	cin>>age;
	cout<<"Your age include "<<Month(age)<<" months!"<<endl;
	return 0;
}

//2.5--convert the Celsiue value to Fahrenheit value.
#include <iostream>
using namespace std;
double Convert(double m)
{
	double Fahrenheit;
	Fahrenheit=m*1.8+32.0;
	return Fahrenheit;
}
int main(void)
{
	double Celsius;
	cout<<"Please enter a Celsius value:";
	cin>>Celsius;
	cout<<Celsius<<" degrees Celsius is "<<Convert(Celsius)<<" degrees Fahrenheit.\n";
	return 0;
}

//2.6--自定义函数实现光年转换为天文单位
#include <iostream>
using namespace std;
double Convert(double years)
{
	return years*63240;
}
int main(void)
{
	double LightYears;
	cout<<"Enter the number of light years:";
	cin>>LightYears;
	cout<<LightYears<<" light years = "<<Convert(LightYears)<<" astronomical units.\n";
	return 0;
}

//2.7--输入小时和分钟，输出时间
#include <iostream>
using namespace std;
void Show(int hour, int minute)
{
	cout<<"Time: "<<hour<<":"<<minute<<endl;
}
int main(void)
{
	int hour,minute;
	cout<<"Enter the number of hours:";
	cin>>hour;
	cout<<"Enter the number of minutes:";
	cin>>minute;
	Show(hour,minute);
	return 0;
}