🔄 整数转回文数Convert Integer to Palindrome
把整数变成回文数：在末尾追加反转数字（保留符号），或仅反转数字。适合趣味数学和练习，本地处理。Turn integers into palindromes by appending the reversed digits (keeping the sign), or only reverse the digits. Handy for recreational math. Processed locally.
使用说明与常见问题How-to & FAQ
「整数转回文数」是什么？What is the Convert Integer to Palindrome tool?
把整数变成回文数：在末尾追加反转数字（保留符号），或仅反转数字。适合趣味数学和练习，本地处理。Turn integers into palindromes by appending the reversed digits (keeping the sign), or only reverse the digits. Handy for recreational math. Processed locally.
如何使用「整数转回文数」？How do I use the Convert Integer to Palindrome tool?
在「整数转回文数」中，把内容粘贴或输入到上方输入框，按需设置「方式」，结果会实时显示在下方，点击「复制结果」即可复制。例如输入「12」，得到「1221」。Paste integers, one per line or separated by spaces. "Append reverse" adds the reversed digits to make a palindrome (12 becomes 1221) and "Reverse digits only" just reverses them; the sign is kept. Click "Copy result" to copy the output.
怎样输入多个整数？How do I enter several integers?
每行一个，或用空格、逗号、分号分隔；可带千位逗号和下划线，负数前面加 -。One per line, or separated by spaces, commas or semicolons; thousands commas and underscores are fine, put - in front of negatives.
结果精确吗？Are the results exact?
精确。所有整数都按大整数（BigInt）处理，不经过浮点，超过 2^53 的数（例如 9007199254740993）也不会被舍入；几千上万行也是线性处理。Yes. Every value is handled as a big integer (BigInt) with no floating-point step, so numbers above 2^53 such as 9007199254740993 are never rounded; thousands of lines are processed in linear time.
0 为什么还是 0？Why does 0 stay 0?
追加模式把数字和它的反转拼在一起（12 → 1221，10 → 1001）。0 本身就是回文数，拼成 00 作为整数仍是 0，所以输出 0，结果说明里会注明。Append mode joins the digits with their reverse (12 → 1221, 10 → 1001). 0 is already a palindrome, and 00 as an integer is still 0, so the output is 0 and the info line says so.
10 反转为什么是 01？Why does reversing 10 give 01?
按数字字符反转并保留前导 0；若只要数值，可再去掉前导 0（本工具保留位形）。Digits are reversed as characters, so a trailing 0 becomes a leading 0; this tool keeps that shape.
输入和输出是什么样的？What does the input and output look like?
例如在「整数转回文数」中输入 12，输出为：1221（⏎ 表示换行）。For example, the Convert Integer to Palindrome turns the input 12 into: 1221 (⏎ marks a line break).
有哪些选项可以调整？What options can I adjust?
「整数转回文数」的设置：「方式」可选 末尾追加反转、仅反转数字（默认 末尾追加反转）；可勾选：「千位逗号」。改动任一选项后结果会按新设置重新生成。Settings in the Convert Integer to Palindrome — "Mode": Append reverse, Reverse digits only (default Append reverse); tick boxes: "Thousands commas". Changing any option regenerates the result with the new setting.
「整数转回文数」免费吗？需要注册吗？Is the Convert Integer to Palindrome free? Do I need an account?
「整数转回文数」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 Convert Integer to 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.