這篇文章主要介紹了PHP實(shí)現(xiàn)的簡(jiǎn)單三角形、矩形周長(zhǎng)面積計(jì)算器分享,本文的實(shí)現(xiàn)相對(duì)較簡(jiǎn)單,同時(shí)提供了代碼文件下載,需要的朋友可以參考下
運(yùn)用PHP面向?qū)ο蟮闹R(shí)設(shè)計(jì)一個(gè)圖形計(jì)算器,同時(shí)也運(yùn)用到了抽象類(lèi)知識(shí),這個(gè)計(jì)算器可以計(jì)算三角形的周長(zhǎng)和面積以及矩形的周長(zhǎng)和面積。本圖形計(jì)算器有4個(gè)頁(yè)面:1.PHP圖形計(jì)算器主頁(yè)index.php; 2.形狀的抽象類(lèi)shape.class.php; 3三角形計(jì)算類(lèi)triangle.class.php; 4.矩形計(jì)算類(lèi)rect.class.php。
代碼分別如下:
PHP圖形計(jì)算器主頁(yè):
- <html>
- <head>
- <title>簡(jiǎn)單的圖形計(jì)算器</title>
- <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
- </head>
- <body>
- <center>
- <h1>簡(jiǎn)單的圖形計(jì)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);
- //設(shè)置自動(dòng)加載這個(gè)程序需要的類(lèi)文件
- function __autoload($classname){
- include strtolower($classname).".class.php";
- }
- //判斷用戶(hù)是否有選擇單擊一個(gè)形狀鏈接
- if(!emptyempty($_GET['action'])) {
- //第一步:創(chuàng)建形狀的對(duì)象
- $classname = ucfirst($_GET['action']);
- $shape=new $classname($_POST);
- //第二步:調(diào)用形狀的對(duì)象中的界面view()
- $shape -> view();
- //第三步:用戶(hù)是否提交了對(duì)應(yīng)圖形界面的表單
- if(isset($_POST['dosubmit'])) {
- //第四步:查看用戶(hù)輸出的數(shù)據(jù)是否正確, 失敗則提示
- if($shape->yan($_POST)) {
- //計(jì)算圖形的周長(zhǎng)和面積
- echo $shape->name."的周長(zhǎng)為:".$shape->zhou()."<br>";
- echo $shape->name."的面積為:".$shape->area()."<br>";
- }
- }
- //如果用戶(hù)沒(méi)有單擊鏈接, 則是默認(rèn)訪(fǎng)問(wèn)這個(gè)主程序
- }else {
- echo "請(qǐng)選擇一個(gè)要計(jì)算的圖形!<br>";
- }
- ?>
- </body>
- </html>
形狀的抽象類(lèi):
- abstract class Shape{
- //形狀的名稱(chēng)
- public $name;
- //形狀的計(jì)算面積方法
- abstract function area();
- //形狀的計(jì)算周長(zhǎng)的方法
- abstract function zhou();
- //形狀的圖形表單界面
- abstract function view();
- //形狀的驗(yàn)證方法
- abstract function yan($arr);
- }
三角形計(jì)算類(lèi)文件:
- class Triangle extends Shape {
- private $bian1;
- private $bian2;
- private $bian3;
- function __construct($arr = array()) {
- if(!emptyempty($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 .= $this->name.'第一個(gè)邊:<input type="text" name="bian1" value="'.$_POST['bian1'].'" /><br>';
- $form .= $this->name.'第二個(gè)邊:<input type="text" name="bian2" value="'.$_POST['bian2'].'" /><br>';
- $form .= $this->name.'第三個(gè)邊:<input type="text" name="bian3" value="'.$_POST['bian3'].'" /><br>';
- $form .= '<input type="submit" name="dosubmit" value="計(jì)算"><br>';
- $form .='<form>';
- echo $form;
- }
- function yan($arr) {
- $bj = true;
- if($arr['bian1'] < 0) {
- echo "第一個(gè)邊不能小于0!<br>";
- $bj = false;
- }
- if($arr['bian2'] < 0) {
- echo "第二個(gè)邊不能小于0!<br>";
- $bj = false;
- }
- if($arr['bian3'] < 0) {
- echo "第三個(gè)邊不能小于0!<br>";
- $bj = false;
- }
- if(($arr['bian1']+$arr['bian2'] < $arr['bian3']) || ($arr['bian1'] + $arr['bian3'] < $arr['bian2']) || ($arr['bian2']+$arr['bian3'] < $arr['bian1'])) {
- echo "兩邊之和必須大于第三個(gè)邊";
- $bj = false;
- }
- return $bj;
- }
- }
矩形計(jì)算類(lèi)文件:
- class Rect extends Shape {
- private $width;
- private $height;
- function __construct($arr=array()) {
- if(!emptyempty($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 .= $this->name.'的寬:<input type="text" name="width" value="'.$_POST['width'].'" /><br>';
- $form .= $this->name.'的高:<input type="text" name="height" value="'.$_POST['height'].'" /><br>';
- $form .= '<input type="submit" name="dosubmit" value="計(jì)算"><br>';
- $form .='<form>';
- echo $form;
- }
- function yan($arr) {
- $bg = true;
- if($arr['width'] < 0) {
- echo $this->name."的寬不能小于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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