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十进制数的次方

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Release: 2016-05-26 08:19:36
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十进制数是多少次方

<?php
//十进制转成2进制
$a =16384;
$i=0;
for(;;){
    $a = $a/2;
    var_dump($a);
    $i = $i+1;
    var_dump($i);
    if($a==1){
        echo $i;
        break;
    }
}
//2进制转成十进制
var_dump(pow(2,7));
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