考试Qn：将while while循环转换为for循环（PHP）

Question

Recently, my exams got over. My last exam was based on PHP. I got the following question for my exam:

"Convert the following script using for loop without affecting the output:-"

<?php
 //Convert into for loop
 $x = 0;
 $count = 10;
 do
 {
  echo ($count. "<BR>");
  $count = $count - 2;
  $x = $x + $count; 
 }
 while($count < 1)
 echo ($x);
?>

Please help me as my computer sir is out of station and I am really puzzled by it.

Answer 1

Well, If I understand well, You have to use "for" loop, instead of "do...while", but the printed text must not change.

Try:

$count = 10;
$x = 0;
$firstRun = true;
for(; $count > 1 || $firstRun;) {
    $firstRun = false;
    echo ($count . "<BR>");
    $count -= 2;
    $x = $x + $count; 
}
echo ($x);

By the way loop is unnecessary, because $count will be greater than 1 after the first loop, so the while will get false.

EDIT

• $firstRun to avoid infiniteLoop
• $count in loop

EDIT

• Fixed code for new requirement
• Removed unnecessary code