∑ 求和Sum Calculator

使用说明与常见问题How-to & FAQ

「求和」是什么？What is the Sum Calculator tool?

对一列数字求和（空格/逗号/换行分隔）。本地处理。Sum a list of numbers (space/comma/newline separated). Processed locally.

如何使用「求和」？How do I use the Sum Calculator tool?

在「求和」中，填写上方字段等参数，结果会随输入实时计算并显示在下方。In the Sum Calculator: Fill in the fields above; results are recalculated instantly as you type.

可以输入科学计数法吗？Can I use scientific notation?

可以，1e3、2.5E-4 这样的写法都会被识别为数字。数字之间用空格、逗号或换行分隔，结果是所有数的和。Yes, forms such as 1e3 or 2.5E-4 are read as numbers. Separate the numbers with spaces, commas or line breaks; the result is their total.

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」按 1 和 000 两个数计算，和为 1。要输入一千请写 1000，不要加千位分隔符；输入里有被逗号拆开的数时（例如 1,000 或 1,5），页面会提示它被读成了哪几个数。No. The comma is a separator, so "1,000" is read as the two numbers 1 and 000, summing to 1. Write one thousand as 1000 without a thousands separator; the page shows a note naming any number a comma split (for example "1,000 was read as 1 and 000", or "1,5 was read as 1 and 5").

计算精度如何？How precise are the results?

「求和」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Sum Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.

「求和」免费吗？需要注册吗？Is the Sum Calculator free? Do I need an account?

「求和」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 Sum Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.