[C++] 用Xcode来写C++程序[7] Class

//
//  Rectangle.h
//  Plus
//
//  Created by YouXianMing on 15/3/12.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#ifndef __Plus__Rectangle__
#define __Plus__Rectangle__

#include <stdio.h>

class Rectangle {

int width;  // 宽
int height; // 长

public:

/**
*  面积
*
*  @return 求取面积
*/
int  area();

/**
*  设置长与宽
*
*  @param x 长
*  @param y 宽
*/
void set_values (int x, int y);
};

#endif

//
//  Rectangle.cpp
//  Plus
//
//  Created by YouXianMing on 15/3/12.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#include "Rectangle.h"

int Rectangle::area() {
return width * height;
}

void Rectangle::set_values (int x, int y) {
width  = x;
height = y;
}

#include <iostream>
#include "Rectangle.h"

using namespace std;

int main () {

// 创建出对象
Rectangle rect;

// 给对象设置值
rect.set_values(3, 4);

// 打印对象的面积
cout << "area: " << rect.area();

return 0;
}

//
//  Rectangle.h
//  Plus
//
//  Created by YouXianMing on 15/3/12.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#ifndef __Plus__Rectangle__
#define __Plus__Rectangle__

#include <stdio.h>

class Rectangle {

int width;  // 宽
int height; // 长

public:

/**
*  构造函数
*/
Rectangle(int, int);

/**
*  面积
*
*  @return 求取面积
*/
int  area();
};

#endif

//
//  Rectangle.cpp
//  Plus
//
//  Created by YouXianMing on 15/3/12.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#include "Rectangle.h"

int Rectangle::area() {
return width * height;
}

#include <iostream>
#include "Rectangle.h"

using namespace std;

int main () {

// 创建出对象
Rectangle rect(3, 4);

// 打印对象的面积
cout << "area: " << rect.area();

return 0;
}

//
//  Rectangle.h
//  Plus
//
//  Created by YouXianMing on 15/3/12.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#ifndef __Plus__Rectangle__
#define __Plus__Rectangle__

#include <stdio.h>

class Rectangle {

int width;  // 宽
int height; // 长

public:

/**
*  构造函数
*/
Rectangle(int x, int y);
Rectangle();

/**
*  面积
*
*  @return 求取面积
*/
int  area();
};

#endif

//
//  Rectangle.cpp
//  Plus
//
//  Created by YouXianMing on 15/3/12.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#include "Rectangle.h"

int Rectangle::area() {
return width * height;
}

Rectangle::Rectangle() {
width  = 5;
height = 5;
}

Rectangle::Rectangle(int x, int y) {
width  = x;
height = y;
}

#include <iostream>
#include "Rectangle.h"

using namespace std;

int main () {

// 创建出对象
Rectangle rectA(3, 4);
Rectangle rectB;

// 打印对象的面积
cout << "areaA: " << rectA.area() << endl;
cout << "areaB: " << rectB.area() << endl;

return 0;
}