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  • PHP图形计算器(计算三角形矩形周长面积)

    运用PHP面向对象的知识设计一个图形计算器,同时也运用到了抽象类知识,这个计算器可以计算三角形的周长和面积以及矩形的周长和面积。本图形计算器有4个页面:1.PHP图形计算器主页index.php;    2.形状的抽象类shape.class.php;    3三角形计算类triangle.class.php;    4.矩形计算类rect.class.php。

    PHP图形计算器代码点击下载:   php图形计算器.zip

    代码分别如下:

    PHP图形计算器主页:

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    <html>
        <head>
            <title>简单的图形计算器</title>
            <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
        </head>
     
        <body>
            <center>
                <h1>简单的图形计算器</h1>
     
                <a href="index.php?action=rect">矩形</a> ||
                <a href="index.php?action=triangle">三角形</a>
            </center>
     
            <hr><br>
     
        <?php
                error_reporting(E_ALL & ~E_NOTICE);
     
                //设置自动加载这个程序需要的类文件
                function __autoload($classname){
                    include strtolower($classname).".class.php";
                }
     
                //判断用户是否有选择单击一个形状链接
                if(!empty($_GET['action'])) {
                    //第一步:创建形状的对象
                    $classname = ucfirst($_GET['action']);
     
                    $shape=new $classname($_POST);
                    //第二步:调用形状的对象中的界面view()
                    $shape -> view();
     
                    //第三步:用户是否提交了对应图形界面的表单
                    if(isset($_POST['dosubmit'])) {
                        //第四步:查看用户输出的数据是否正确, 失败则提示
                        if($shape->yan($_POST)) {
                            //计算图形的周长和面积
                            echo $shape->name."的周长为:".$shape->zhou()."<br>";
                            echo $shape->name."的面积为:".$shape->area()."<br>";
                        }
                    }
     
                //如果用户没有单击链接, 则是默认访问这个主程序
                }else {
                    echo "请选择一个要计算的图形!<br>";
     
                }
     
            ?>
        </body>
    </html>

    形状的抽象类:

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    abstract class  Shape{
        //形状的名称
        public $name;
     
        //形状的计算面积方法
        abstract function area();
     
        //形状的计算周长的方法
        abstract function zhou();
     
        //形状的图形表单界面
        abstract function view();
        //形状的验证方法
        abstract function yan($arr);
     
    }

    三角形计算类文件:

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    class Triangle extends Shape {
        private $bian1;
        private $bian2;
        private $bian3;
     
        function __construct($arr = array()) {
            if(!empty($arr)) {
                $this->bian1 = $arr['bian1'];
                $this->bian2 = $arr['bian2'];
                $this->bian3 = $arr['bian3'];
     
            }
     
            $this->name = "三角形";
        }
     
        function area() {
            $p =    ($this->bian1 + $this->bian2 + $this->bian3)/2;
     
            return sqrt($p*($p-$this->bian1)*($p-$this->bian2)*($p-$this->bian3));
        }
     
        function zhou() {
            return $this->bian1 + $this->bian2 + $this->bian3;
        }
     
        function view() {
            $form = '<form action="index.php?action=triangle" method="post">';
            $form .= $this->name.'第一个边:<input type="text" name="bian1" value="'.$_POST['bian1'].'" /><br>';
            $form .= $this->name.'第二个边:<input type="text" name="bian2" value="'.$_POST['bian2'].'" /><br>';
            $form .= $this->name.'第三个边:<input type="text" name="bian3" value="'.$_POST['bian3'].'" /><br>';
            $form .= '<input type="submit" name="dosubmit" value="计算"><br>';
            $form .='<form>';
            echo $form;
        }
     
        function yan($arr) {
            $bj = true;
            if($arr['bian1'] < 0) {
                echo "第一个边不能小于0!<br>";
                $bj = false;
            }
     
            if($arr['bian2'] < 0) {
                echo "第二个边不能小于0!<br>";
                $bj = false;
            }
     
            if($arr['bian3'] < 0) {
                echo "第三个边不能小于0!<br>";
                $bj = false;
            }
     
            if(($arr['bian1']+$arr['bian2'] < $arr['bian3']) || ($arr['bian1'] + $arr['bian3'] < $arr['bian2']) || ($arr['bian2']+$arr['bian3'] < $arr['bian1'])) {
                echo "两边之和必须大于第三个边";
                $bj = false;
            }
     
            return $bj;
        }
    }

    矩形计算类文件:

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    class Rect extends Shape {
        private $width;
        private $height;
     
        function __construct($arr=array()) {
     
            if(!empty($arr)) {
                $this->width = $arr['width'];
                $this->height = $arr['height'];
            }
            $this->name = "矩形";
        }
     
        function area() {
            return $this->width * $this->height;
        }
     
        function zhou() {
            return 2*($this->width + $this->height);
        }
     
        function view() {
            $form = '<form action="index.php?action=rect" method="post">';
            $form .= $this->name.'的宽:<input type="text" name="width" value="'.$_POST['width'].'" /><br>';
            $form .= $this->name.'的高:<input type="text" name="height" value="'.$_POST['height'].'" /><br>';
            $form .= '<input type="submit" name="dosubmit" value="计算"><br>';
            $form .='<form>';
            echo $form;
        }
     
        function yan($arr) {
            $bg = true;
            if($arr['width'] < 0) {
                echo $this->name."的宽不能小于0!<br>";
                $bg = false;   
            }
     
            if($arr['height'] < 0) {
                echo $this->name."的高度不能小于0!<br>";
                $bg = false;
            }
     
            return $bg;
        }
     
    }

     

     
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  • 原文地址:https://www.cnblogs.com/ncong/p/3950472.html
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