∏ 计算数字列表乘积Calculate Number Product

使用说明与常见问题How-to & FAQ

「计算数字列表乘积」是什么？What is the Calculate Number Product tool?

计算一列整数的乘积。本地处理。Product of a list of integers. Processed locally.

如何使用「计算数字列表乘积」？How do I use the Calculate Number Product tool?

在「计算数字列表乘积」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。例如输入「2 3 4」，得到「24」。In the Calculate Number Product: Paste or type into the input box; the result appears below instantly — click "Copy result" to copy it. Example: "2 3 4" → "24".

空输入或小数会怎样？What about empty input or decimals?

至少需要一个整数；只有空格时会提示。小数、1e3 这类写法会指出是第几项不是整数，而不是悄悄取整。At least one integer is needed; input with only spaces gives a message. Decimals or forms like 1e3 get a message naming the item that is not an integer, instead of being silently rounded.

结果精确吗？Is the result exact?

精确。每个整数都按大整数（BigInt）读入并相乘，不经过浮点，所以位数再多也不会丢失精度，例如 30 位 × 30 位的乘积会给出完整的 60 位结果。数之间可用空格、换行、逗号或分号分隔。Yes. Every integer is read as a big integer (BigInt) and multiplied with no floating point, so no digits are lost however long the numbers are; for example a 30-digit × 30-digit product gives the full 60-digit result. Separate the numbers with spaces, line breaks, commas or semicolons.

1,000 会被当成一千吗？Is 1,000 read as one thousand?

不会。逗号是分隔符，所以「1,000 2」按 1、000、2 三个数计算，乘积是 0。要输入一千请写 1000，不要加千位分隔符；输入里出现 1,000 这样的写法时页面会提示。No. The comma is a separator, so '1,000 2' is read as the three numbers 1, 000 and 2, giving a product of 0. Write one thousand as 1000 without a thousands separator; the page shows a note when the input contains a pattern like 1,000.

输入和输出是什么样的？What does the input and output look like?

例如在「计算数字列表乘积」中输入 2 3 4，输出为：24。For example, the Calculate Number Product turns the input 2 3 4 into: 24.

「计算数字列表乘积」免费吗？需要注册吗？Is the Calculate Number Product free? Do I need an account?

「计算数字列表乘积」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 Calculate Number Product is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.