C++学習ノート(十一)--対象

1構造体からクラスへ

//  .cpp :              。
//
#include "stdafx.h"
#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;

struct Ps //C++                          public  
{
private:
	string name;
	int age;
public:
	Ps():name("xiaoming"),age(17){}
	Ps(const char *name,int age):name(name),age(age){}
	void show()
	{
		cout << name <<" " << age <<endl;
	}
};


class Ps2
{
private:
	string name;
	int age;
public:
	Ps2():name("xiaoming"),age(17){}
	Ps2(const char *name,int age):name(name),age(age){}
	void show()
	{
		cout << name <<" " << age <<endl;
	}
};

int _tmain(int argc, _TCHAR* argv[])
{
	Ps s;
	s.show();
	//cout << s.age << endl;
	
	Ps2 s2("daming",20);
	s2.show();

	system("pause");
	return 0;
}

#include <iostream>
#include <string>
using namespace std;
struct Ps
{
	string name;
	int age;
	void show()
	{
		cout << "  " << name << ",  " << age <<endl;
	}
}; //          new types may not be defined in a return type


class Pc
{
	string name;
	int age;
public:
	Pc(const char *n,int a){name=n;age=a;}
	void show()
	{
		cout << "  " << name << ",  " << age <<endl;
	}
};//    


int main()
{
	Ps a = {"  ",18}; //      
	Pc c("  ",20); //     

	a.show();
	c.show();

}

2一般的にクラスの定義と実装は別々に書く
08time.h

#ifndef TIME_H
#define TIME_H
class Time
{
	int h,m,s;
public:
	Time();
	Time(int h,int m,int s);
	void tick();
	void show();
};
#endif

//        
//cpp    

08time.cpp

#include <iostream>
#include <iomanip>
#include "08time.h"
using namespace std;

Time::Time(){h=m=s=0;}//Time::            
Time::Time(int h,int m,int s)
{
	Time::h=h; Time::m=m;Time::s=s;
}

void Time::tick()
{
	if(++s >= 60)
	{
		s = 0;
		if(++m >= 60)
		{
			m = 0;
			if(++h >= 24)
			{
				h=0;
			}
		}
	}
}

void Time::show()
{
	cout << setfill('0') <<setw(2)  << h << ':' << setw(2)
		<< m <<  ':' << setw(2) << s << endl;
}



int main()
{
	Time t(10,56,00);
	while(1)
	{
		sleep(1);
		t.tick();
		t.show();	

	}

}