11. Working with Classes

// listing11_1_to_11_3_mytime
// listing 11.1 mytime0.h -- Time class before operator overloading
#ifndef MYTIME0_H_
#define MYTIME0_H_
class Time
{
private:
	int hours;
	int minutes;
public:
	Time();
	Time(int h, int m = 0);
	void AddMin(int m);
	void AddHr(int h);
	void Reset(int h = 0, int m = 0);
	Time Sum(const Time & t) const;
	void Show() const;
};
#endif
// listing 11.2 mytime0.cpp -- implementing Time methods
#include <iostream>
#include "mytime0.h"
Time::Time()
{
	hours = minutes = 0;
}
Time::Time(int h, int m)
{
	hours = h;
	minutes = m;
}
void Time::AddMin(int m)
{
	minutes += m;
	hours += minutes / 60;
	minutes %= 60;
}
void Time::AddHr(int h)
{
	hours += h;
}
void Time::Reset(int h, int m)
{
	hours = h;
	minutes = m;
}
Time Time::Sum(const Time & t) const
{
	Time sum;
	sum.minutes = minutes + t.minutes;
	sum.hours = hours + t.hours + sum.minutes / 60;
	sum.minutes %= 60;
	return sum;
}
void Time::Show() const
{
	std::cout << hours << " hours, " << minutes << " minutes";
}
// listing 11.3 usetime0.cpp -- using the first draft of the Time class
// compile usetime0.cpp and mytime0.cpp together
#include <iostream>
#include "mytime0.h"
int main()
{
	using std::cout;
	using std::endl;
	Time planning;
	Time coding(2, 40);
	Time fixing(5, 55);
	Time total;
	cout << "planning time = ";
	planning.Show();
	cout << endl;
	cout << "coding time = ";
	coding.Show();
	cout << endl;
	cout << "fixing time = ";
	fixing.Show();
	cout << endl;
	total = coding.Sum(fixing);
	cout << "coding.Sum(fixing) = ";
	total.Show();
	cout << endl;
	return 0;
}

//  listing11_4_to_11_6_mytime1
// listing 11.4 mytime1.h -- Time class before operator overloading
#ifndef MYTIME1_H_
#define MYTIME1_H_
class Time
{
private:
	int hours;
	int minutes;
public:
	Time();
	Time(int h, int m = 0);
	void AddMin(int m);
	void AddHr(int h);
	void Reset(int h = 0, int m = 0);
	Time operator+(const Time & t) const;
	void Show() const;
};
#endif
// mytime1.cpp -- implementing Time methods
#include <iostream>
#include "mytime1.h"
Time::Time()
{
	hours = minutes = 0;
}
Time::Time(int h, int m)
{
	hours = h;
	minutes = m;
}
void Time::AddMin(int m)
{
	minutes += m;
	hours += minutes / 60;
	minutes %= 60;
}
void Time::AddHr(int h)
{
	hours += h;
}
void Time::Reset(int h, int m)
{
	hours = h;
	minutes = m;
}
Time Time::operator+(const Time & t) const
{
	Time sum;
	sum.minutes = minutes + t.minutes;
	sum.hours = hours + t.hours + sum.minutes / 60;
	sum.minutes %= 60;
	return sum;
}
void Time::Show() const
{
	std::cout << hours << " hours, " << minutes << " minutes";
}
// usetime1.cpp -- using the second draft of the Time class
// compile usetime1.cpp and mytime1.cpp together
#include <iostream>
#include "mytime1.h"
int main()
{
	using std::cout;
	using std::endl;
	Time planning;
	Time coding(2, 40);
	Time fixing(5, 55);
	Time total;
	cout << "planning time = ";
	planning.Show();
	cout << endl;
	cout << "coding time = ";
	coding.Show();
	cout << endl;
	cout << "fixing time = ";
	fixing.Show();
	cout << endl;
	total = coding + fixing;
	// operator notation
	cout << "coding + fixing = ";
	total.Show();
	cout << endl;
	Time morefixing(3, 28);
	cout << "more fixing time = ";
	morefixing.Show();
	cout << endl;
	total = morefixing.operator+(total);
	// function notation
	cout << "morefixing.operator+(total) = ";
	total.Show();
	cout << endl;
	return 0;
}

标签：11,const,Working,int,void,hours,Classes,Time,minutes
来源： https://blog.csdn.net/junleichen/article/details/120685414