多条件循环 [英] Do-While Loop with Multiple Conditions

问题描述

do-while循环可以有多个条件吗？如果是这样，我无法弄清楚为什么下面的代码除了第一个条件之外，在所有条件下都失败。

Can a do-while loop have multiple conditions? If so, I can't figure out why the code below is failing on all but the first condition.

使用的函数...

function gcf($a,$b) {
$a = abs($a); $b = abs($b);
if( $a < $b) list($b,$a) = Array($a,$b);
if( $b == 0) return $a;
$r = $a % $b;
while($r > 0) {
    $a = $b;
    $b = $r;
    $r = $a % $b;
}
return $b;
}


function factors($n){
$factors_array = array();
for ($x = 1; $x <= sqrt(abs($n)); $x++)
{
    if ($n % $x == 0)
    {
        $z = $n/$x; 
        array_push($factors_array, $x, $z);
    }
}
return $factors_array;
}

代码...

$a = $b;

do{
    $a = mt_rand(8, 100);
    $a_factors_array = factors($a);

    $b = mt_rand(8, 100);
    $b_factors_array = factors($b);

} while ($a == $b && count($a_factors_array) < 4 && count($b_factors_array) < 4 && gcf($a, $b) == 1);

echo $a . '<br>';
echo $b . '<br>';

echo count($a_factors_array) . '<br>';
echo count($b_factors_array) . '<br>';

echo gcf($a, $b) . '<br>';

我不断得到$ a和$ b的因子小于4且GCF为1.有什么想法吗？

I keep getting numbers for $a and $b that have less than 4 factors and have a GCF of 1. Any ideas?

推荐答案

您将需要 || & 。只要满足您的条件之一，您就想重复循环。当前，仅在满足 all 个条件的情况下重复循环。

You'll need || instead of &&. You want to repeat the loop as long as any one of your conditions is met. Currently the loop is only repeated if all of the conditions are met.

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