Php 代码打印交替加减序列

Question

如何在 php 中打印序列 36 31 29 24 22 17 15

它是-5，-2模式

Answer 1

您应该交替递减值

$start = 36;
$end = 15;
$x = $start;
$delta = 5;
while ($x >= $end)
{
    echo "$x<BR>";
    $x = $x - $delta;
    if ($delta == 5)
        $delta=2;
    else
        $delta=5;
}