C++ Primer Plus 编程练习2.7

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// 2.7编程练习
#include <iostream>
using namespace std;

//1.
int main1()
{
	cout << "My name is HX, LIve in WuHan"<<endl;
	return 0;
}

//2.
double longtoma(double);
int main2()
{
	double lo;
	cout <<"Enter the long: ";
	cin >> lo;
	double m = longtoma(lo);
	cout << lo << " long="<<m <<" ma" << endl;
	return 0;
}
double longtoma(double l)
{
	return 220 * l;
}

//3.
void mice();
void see();
int main3()
{
	mice();
	mice();
	see();
	see();
	return 0;
}
void mice()
{
	cout << "Three blind mice" << endl;
} 
void see()
{
	cout << "See how they run" << endl;
}

//4.
int main4()
{
	int age;
	cout << "Enter your age: ";
	cin >> age;
	int month = 12 * age;
	cout <<age<< " years is " << month << " months. " << endl;
	return 0;
}

//5.
double C2F(double);
int main5()
{
	double Celsius = 0.0;
	cout << "Please enter a Celsius value : ";
	cin >> Celsius;
	double Fahrenheit = C2F(Celsius);
	cout << Celsius << " degrees Celsius is " << Fahrenheit << " degrees Fahrenheit." << endl;
	return 0;
}
double C2F(double t)
{
	return (1.8 * t + 32.0);
}

//6.
double convert(double);
int main6()
{
	double light_year;
	cout << "Enter the number of light years: ";
	cin >> light_year;
	double astro_units = convert(light_year);
	cout << light_year << " light years = " << astro_units << " astronomical units . " << endl;
	return 0;
}
double convert(double t)
{
	return 63240* t;
}

//7.
void time(int h, int m);
int main()
{
	int hour, minutes;
	cout << "Enter the number of hours: ";
	cin >> hour;
	cout << "Enter the number of minutes: ";
	cin >> minutes;
	time(hour,minutes);
	return 0;
}
void time(int h,int m)
{
	cout << "Time: " << h << ":" << m << endl;
}