7.10.5 PHP图形计算器主程序完成检验

7.11.1 与类有关的魔术常量和函数

index.php

    
        
        
    

    
        
            
简单的图形计算器

            矩形 ||
            三角形 
        

        



     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()."
";
                        echo $shape->name."的面积为：".$shape->area()."
";
                    }
                }
                

            //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!
";
            
            }

        ?>
    

rect.class.php

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 .= $this->name.'的宽:
';
        $form .= $this->name.'的高:
';
        $form .= '
';
        $form .='';
        echo $form;
    }

    function yan($arr) {
        $bg = true;
        if($arr['width'] < 0) {
            echo $this->name."的宽不能小于0!
";
            $bg = false;    
        }

        if($arr['height'] < 0) {
            echo $this->name."的高度不能小于0!
";
            $bg = false;
        }

        return $bg;
    }

}

shape.class.php

triangle.class.php

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 .= $this->name.'第一个边:
';
        $form .= $this->name.'第二个边:
';
        $form .= $this->name.'第三个边:
';
        $form .= '
';
        $form .='';
        echo $form;
    }

    function yan($arr) {
        $bj = true;
        if($arr['bian1'] < 0) {
            echo "第一个边不能小于0!
";
            $bj = false;
        }

        if($arr['bian2'] < 0) {
            echo "第二个边不能小于0!
";
            $bj = false;
        }

        if($arr['bian3'] < 0) {
            echo "第三个边不能小于0!
";
            $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; 
    }
}