{
$a = $this->a;
$b = $this->b;
$num = $a - $b;
echo "{$a}-{$b}={$num}</br>";
}
function multiply()
{
$a = $this->a;
$b = $this->b;
$num = $a * $b;
echo "{$a}*{$b}={$num}</br>";
}
function divide()
{
$a = $this->a;
$b = $this->b;
$num = $a / $b;
echo "{$a}/{$b}={$num}</br>";
}
function __construct($a, $b)
{
$this->a = $a;
$this->b = $b;
}
}
$cal = new cal(5, 2);
$cal->add();
$cal->minus();
$cal->multiply();
$cal->divide();
$b = $this->b;
if ($b == self::A) {
echo $this->a . "</br>";
} else {
if ($b < self::A) {
echo '$this->a' . '$this->b' . self::i . "</br>";
} else {
echo "{$this->a}+{$b}" . self::i . "</br>";
}
}
}
}
class num extends cal
{
public $a;
public $b;
public $num;
const i = "i";
function __construct($a, $b)
{
$this->a = $a;
$this->b = $b;
$this->num = "(" . "{$a}+{$b}" . self::i . ")";
}
}
$num1 = new num(5, 2);
$num2 = new num(1, 2);
$cal = new cal();
$cal->add($num1, $num2);
$cal->minus($num1, $num2);