Ответы на вопрос:
< head> < meta charset="utf-8"> < title> факториал< /title> < /head> < body> < form action="/test.php" method="post"> < p> < input name="go" placeholder="enter number" maxlength="20"> < /p> < p> < input type="submit" value="send"> < /p> < /action> < ? php if (isset($_post["go"])) {echo factorial($_post["go"]); } function factorial($n) { return $n? $n*factorial($n-1): 1; } ? > < /form> < /body> < /html> вариант2< head> < meta charset="utf-8"> < title> factor< /title> < /head> < body> < form action="/test.php" method="post"> < p> < input name="go" placeholder="enter number" maxlength="20"> < /p> < p> < input type="submit" value="send"> < /p> < /action> < ? php if (isset($_post["go"])) {echo $_post["go"]."! ="; $result=1; $go=($_post["go"]); while ($go> 1){$result=$result*($go); echo $go."x"; $go--; }echo "1=".$result; }? > < /form> < /body> < /html>
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