🔁 检查回文数Check Number Palindrome

使用说明与常见问题How-to & FAQ

「检查回文数」是什么？What is the Check Number Palindrome tool?

判断整数是否为回文数（正反读相同），可忽略符号。本地处理。可设置「忽略负号」。Check whether an integer is a palindrome (same forwards and backwards); optional ignore sign. Processed locally. Settings: Ignore minus sign.

如何使用「检查回文数」？How do I use the Check Number Palindrome tool?

在「检查回文数」中，把内容粘贴或输入到上方输入框，结果会实时显示在下方，点击「复制结果」即可复制。In the Check Number Palindrome: Paste or type into the input box; the result appears below instantly — click "Copy result" to copy it.

前导零和逗号怎么算？How are leading zeros and commas treated?

按你输入的数字串原样判断，不去掉也不补前导零：010 是回文，007 不是。千位逗号、空格会先去掉（1,221 按 1221 判断）。不勾选「忽略负号」时，负数一律不算回文。The digit string is judged exactly as you type it, without removing or adding leading zeros: 010 is a palindrome and 007 is not. Thousands commas and spaces are removed first (1,221 is checked as 1221). Unless Ignore minus sign is ticked, a negative number is never a palindrome.

能用多大的数？举个例子？How large can the number be? An example?

任意长度（最多 10000 位），按数字串逐位比较，不经过浮点。例如输入 12345678987654321，结果为「是」（英文界面显示 yes）；输入 123，结果为「否」（no）。Any length up to 10,000 digits; the digits are compared as text (processed as text), with no floating point. For example, 12345678987654321 gives yes, and 123 gives no.

有哪些选项可以调整？What options can I adjust?

「检查回文数」的设置：可勾选：「忽略负号」。每次生成结果都按当前设置处理。Settings in the Check Number Palindrome — tick boxes: "Ignore minus sign". The result always uses the current settings.

「检查回文数」免费吗？需要注册吗？Is the Check Number Palindrome free? Do I need an account?

「检查回文数」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Check Number Palindrome is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.