題目：在輸入框內輸入5個數（輸入那5個數用空格隔開），請用一維數組來編寫一個程式求出他們的平均值(保留2位小數位)。大家可以自己想想怎麼做。
參考代碼：
<html><head><meta http-equiv="Content-Type" content="text/html;charset=utf-8" ></head><body><h3>請輸入5個數，並且用空格隔開</h3><?php //接收提交(輸入過來的值) REQUEST $grade =@$_REQUEST['grade']; //echo $grades; //拆分成數組 $grades = explode(" ",$grade); //print_r($grades); //定義一個變數存放總數 $total=0; //計算總分 for($i=0;$i<count($grades);$i++){ $total +=$grades[$i]; } //round函數 保留小數位||這是四捨五入法保留2位小數 //echo '平均數為：'.round($total/count($grades),2);?><form action="array01.php" method="post"> 請輸入:<input type="text" name="grade" value="<?php echo $grade;?>"> <input type="submit" value="請提交"></form><?php //number_format()函數 是保留位元，同時格式化數字加千位符 echo '平均數為：'.number_format($total/count($grades),2); //echo '平均數為：'.round($total/count($grades),2);?></body></html>
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