当前位置:Gxlcms > PHP教程 > php面向对象编程练习:计算矩形、三角形、圆形的周长和面积

php面向对象编程练习:计算矩形、三角形、圆形的周长和面积

时间:2021-07-01 10:21:17 帮助过:15人阅读


刚刚学完php面向对象的编程,参考着高洛峰老师的php教程学习了这个实例。

效果图片:

三角形
矩形
圆形

以下是实现代码:

index.php
<html><head>
    <title>图形计算(使用面向对象开发技术)</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
    <center>
        <h1>图形(周长&面积) 计算器</h1>
        <a href="index.php?action=rect">矩形</a>
        <a href="index.php?action=triangle">三角形</a>
        <a href="index.php?action=circle">圆形</a>
        <hr>
    </center>


    <?php  //php代码部分
        error_reporting(E_ALL & ~E_NOTICE);//提示错误的等级
    // __autoload是php中的魔术方法,在用到类的时候自动调用
        function __autoload($className){
            //自动导入这个类
            include strtolower($className).".class.php";
        }
        //
输出表单,form类中有魔术方法__toString,因此可以直接输出类的对象引用,就是输出对象返回的字符串 echo new Form(); if(isset($_POST["sub"])){ //输出结果 echo new Result();//直接输出对象的引用表示 } ?></body></html>
form.class.php_这是表单类_
<?php
    //根据index中提交的不同action的值返回不同的表单
    class Form{
        private $action;        private $shape;        //构造方法
        function __construct($action=""){
            $this->action = $action;            $this->shape=isset($_REQUEST["action"])?$_REQUEST["action"]:"rect";
        }        function __toString()
        {
            // TODO: Implement __toString() method.
            $form='<form action="'.$this->action.'"  method="post">';            switch($this->shape){                case "rect":                    $form.=$this->getRect();                    break;                case "triangle":                    $form.=$this->getTriangle();                    break;                case "circle":                    $form.=$this->getCircle();                    break;                default:                    $form.='请选择一个形状<br>';
            }            $form.='<input type="submit" name="sub" value="计算">';            $form.='</form>';            return $form;
        }        private function getRect(){
            $input='<b>请输入 | 矩形 | 的宽度和高度:</b><p>';            $input.='宽度:<input type="text" name="width" value="'.$_POST['width'].'"><br>';            $input.='高度:<input type="text" name="height" value="'.$_POST['height'].'"><br>';            $input.='<input type="hidden" name="action" value="rect">';            return $input;
        }        private function getTriangle(){
            $input='<b>请输入 | 三角形 | 的三条边:</b><p>';            $input.='第一边: <input type="text" name="side1" value="'.$_POST['side1'].'" ><br>';            $input.='第二边: <input type="text" name="side2" value="'.$_POST['side2'].'" ><br>';            $input.='第三边: <input type="text" name="side3" value="'.$_POST['side3'].'" ><br>';            $input.='<input type="hidden" name="action" value="triangle">';            return $input;
        }        private function getCircle(){
            $input='<b>请输入 | 圆形 | 的半径:</b><p>';            $input.='半径: <input type="text" name="radius" value="'.$_POST['radius'].'" ><br>';            $input.='<input type="hidden" name="action" value="circle">';            return $input;
        }

    }/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/4/15
 * Time: 16:26
 *
 */
shape.class.php 这是一个抽象类,用来定义规范的
<?phpabstract class Shape {
    public $shapeName;    //规范circle、triangle、rect中必须有area()、perimeter()方法
    abstract function area();
    abstract function perimeter();

    public function setShapeName($shapeName)
    {
        $this->shapeName = $shapeName;        return $this;
    }    //判断输入的数字是否为大于0的有效数字
    protected function validate($value, $message="形状"){
        if($value == "" || !is_numeric($value) || $value < 0 ){            echo '<font color="red"> '.$message.' 必须为非负值的数字,并且不能为空 </font><br>';            return false;
        } else {            return true;
        }
    }
}/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/4/15
 * Time: 16:42
 */
circle.class.php_就是计算周长和面积的公式了_
<?phpclass Circle extends Shape {
    private $radius=0;    function __construct(){
        $this->shapeName="圆形";        if($this->validate($_POST['radius'], '圆的半径')){            $this->radius=$_POST["radius"];
        }else{            exit;
        }
    }    function area(){
        return pi()*$this->radius*$this->radius;
    }    function perimeter(){
        return 2*pi()*$this->radius;
    }
}/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/4/15
 * Time: 17:06
 */
rect.class.php
<?phpclass Rect extends Shape{
    private $width=0;    private $height=0;    function __construct()
    {
        $this->shapeName="矩形";        if($this->validate($_POST["width"],'矩形的宽度') & $this->validate($_POST["height"],'矩形的高度'))
        {            $this->width=$_POST["width"];            $this->height=$_POST["height"];
        }        else{            exit;
        }
    }    function area(){
        return $this->width*$this->height;
    }    function perimeter()
    {
        return 2 * ($this->width + $this->height);
    }
}/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/4/15
 * Time: 17:02
 */
triangle.class.php
<?phpclass Triangle extends Shape{
    private $side1=0;    private $side2=0;    private $side3=0;    function __construct(){
        $this->shapeName="三角形";        if($this->validate($_POST['side1'], '三角形的第一个边')){            $this->side1=$_POST["side1"];
        }        if($this->validate($_POST['side2'], '三角形的第二个边')){            $this->side2=$_POST["side2"];

        }        if($this->validate($_POST['side3'], '三角形的第三个边')){            $this->side3=$_POST["side3"];
        }        if(!$this->validateSum()){            echo '<font color="red">三角形的两边之和必须大于第三边</font>';            exit;
        }
    }    function area(){
        $s=( $this->side1+$this->side2+$this->side3 )/2;        return sqrt( $s * ($s - $this->side1) * ($s - $this->side2) * ($s - $this->side3) );
    }    function perimeter(){
        return $this->side1+$this->side2+$this->side3;
    }    private function validateSum()
    {
        $condition1 = ($this->side1 + $this->side2) > $this->side3;        $condition2 = ($this->side1 + $this->side3) > $this->side2;        $condition3 = ($this->side2 + $this->side3) > $this->side1;        if ($condition1 && $condition2 && $condition3) {            return true;
        } else {            return false;
        }
    }

}/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/4/15
 * Time: 17:04
 */
result.class.php_这里是返回计算结果类_
<?php
    class Result{        private $shape;

        function __construct()
        {            switch($_POST['action']){                case 'rect':
                    $this->shape=new Rect();                    break;                case 'triangle':
                    $this->shape=new Triangle();                    break;                case 'circle':
                    $this->shape=new Circle();                    break;                default:
                    $this->shape=false;
            }
        }        /**
         * @return string
         */
        function __toString()
        {            // TODO: Implement __toString() method.
            if($this->shape){
                $result=$this->shape->shapeName.'的周长:'.$this->shape->perimeter().'<br>';
                $result.=$this->shape->shapeName.'的面积:'.$this->shape->area().'<br>';                return $result;
            }else{                return '没有这个形状';
            }
        }
    }/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/4/15
 * Time: 16:47
 */

相关推荐:

PHP面向对象 静态延迟绑定static::

以上就是php面向对象编程练习:计算矩形、三角形、圆形的周长和面积 的详细内容,更多请关注Gxl网其它相关文章!

人气教程排行