📦 长方体Cuboid Calculator

使用说明与常见问题How-to & FAQ

「长方体」是什么？What is the Cuboid Calculator tool?

体积 = lwh；表面积 = 2(lw+lh+wh)。本地处理。可设置「长」、「宽」、「高」。Volume = lwh; surface = 2(lw+lh+wh). Processed locally. Settings: Length, Width, Height.

如何使用「长方体」？How do I use the Cuboid Calculator tool?

在「长方体」中，填写「长」、「宽」、「高」等参数，结果会随输入实时计算并显示在下方。In the Cuboid Calculator: Fill in "Length", "Width", "Height"; results are recalculated instantly as you type.

正方体可以吗？Does it work for a cube?

可以，长、宽、高填相同的数就是正方体：体积 a³，表面积 6a²。一般长方体按 lwh 和 2(lw + lh + wh) 计算。Yes. Enter the same length, width and height for a cube: volume a³ and surface area 6a². Any cuboid uses lwh and 2(lw + lh + wh).

能举个计算实例吗？Can you show a worked example?

例如在「长方体」中填 长 = 4，宽 = 3，高 = 2，结果区显示：体积：24；表面积：52For example, entering Length = 4, Width = 3, Height = 2 in the Cuboid Calculator gives: Volume: 24; Surface: 52

哪些输入会被检查？Which inputs are validated?

「长方体」会检查这些输入——「长」、「宽」、「高」：必须填写，须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Cuboid Calculator checks its inputs — "Length", "Width", "Height": required, must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「长方体」的设置：「长」默认 4；「宽」默认 3；「高」默认 2。每次生成结果都按当前设置处理。Settings in the Cuboid Calculator — "Length" default 4; "Width" default 3; "Height" default 2. The result always uses the current settings.

计算精度如何？How precise are the results?

「长方体」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 Cuboid Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.

「长方体」免费吗？需要注册吗？Is the Cuboid Calculator free? Do I need an account?

「长方体」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 Cuboid 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.