面向对象例子 (求阴影部分面积)
(1)面向过程
$r1 = 10;
$r2 = 5;
$mj = 3.14*$r1*$r1-3.14*$r2*$r2;
echo $mj;
(2)面向对象
class Yuan
{
public $r; 半径
function __construct($bj) 构造函数
{
$this->r = $bj;
}
function mianJi() 返回圆的面积
{
return 3.14*$this->r*$this->r;
}
}
$y1 = new Yuan(10);
$y2 = new Yuan(5);
$zmj = $y1->mianJi()-$y2->mianJi();
echo $zmj;
时间: 2024-10-10 00:50:39