🔣 大数计算器Big Number Calculator
任意精度整数计算：加、减、乘、除、取余、乘方、阶乘，结果不丢失精度（BigInt）。Arbitrary-precision integer arithmetic: + − × ÷ mod, power and factorial without losing digits (BigInt).
使用说明与常见问题How-to & FAQ
「大数计算器」是什么？What is the Big Number Calculator tool?
任意精度整数计算：加、减、乘、除、取余、乘方、阶乘，结果不丢失精度（BigInt）。Arbitrary-precision integer arithmetic: + − × ÷ mod, power and factorial without losing digits (BigInt).
如何使用「大数计算器」？How do I use the Big Number Calculator tool?
在「大数计算器」中，填写「A」、「运算」、「B」等参数，结果会随输入实时计算并显示在下方。In the Big Number Calculator: Fill in "A", "Operation", "B"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「大数计算器」使用 JavaScript 双精度浮点数（约 15–16 位有效数字），部分功能使用 BigInt 处理大整数。The Big Number Calculator uses double-precision floating point (about 15–16 significant digits); some features use BigInt for large integers.
「大数计算器」免费吗？需要注册吗？Is the Big Number Calculator free? Do I need an account?
「大数计算器」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 Big Number 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.