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最新推荐文章于 2024-09-30 11:27:07 发布

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最新推荐文章于 2024-09-30 11:27:07 发布

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分类专栏： C++ 面试

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本文展示了一个使用自定义Time类进行时间管理的C++程序实例。该程序定义了Time类的方法，包括显示时间、时间相加等功能，并通过具体实例演示了如何创建Time对象并进行操作。

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// 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 << planning.reverse(123) <<  endl;

	cout << "codeing 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;

}

// 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;

	int reverse(int x);


};
#endif

// 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 ";
}

int Time::reverse(int x)
{
	int res = 0;
	while (x != 0) {
		if (abs(res) > INT_MAX / 10) return 0;
		res = res * 10 + x % 10;
		x /= 10;
	}
	return res;
}