[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;
}