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溢出：+、+% 与 +|

理解陷阱式、回绕式和饱和式运算。

溢出：+、+% 与 +| 是 CoddyKit 上的免费 Zig Academy 课时。这是第 2 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Zig Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Zig Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Numbers Have Limits

Every sized integer has a maximum it can hold. Push past it and you hit overflow, the moment a value tries to grow beyond its range.

Zig Catches Overflow

By default, the plain + operator traps overflow. In a safe build, going past the limit stops your program instead of corrupting the value.

var x: u8 = 255;
x = x + 1; // panics: overflow

Why Trapping Helps

A loud crash beats a silent wrong answer. Trapping turns a sneaky bug into an obvious failure you can find and fix fast.

Wrapping Math with +%

Sometimes you want the value to roll over on purpose. The +% operator wraps around, so 255 + 1 in a u8 becomes 0.

var x: u8 = 255;
x = x +% 1; // 0

When Wrapping Is Right

Wrapping shines for counters, hashes, and checksums where roll-over is the intended behavior. You ask for it with the % suffix, never by accident.

Saturating Math with +|

The +| operator clamps to the limit instead of wrapping. A u8 at 255 stays 255, perfect for values that must not exceed a ceiling.

var x: u8 = 255;
x = x +| 1; // 255

Three Choices, One Decision

So + traps, +% wraps, and +| saturates. You pick the behavior that matches your intent, making overflow handling explicit in your code.

The Same Trio for Subtraction

These suffixes are not just for addition. -, -%, and -| give you trapping, wrapping, and saturating subtraction the very same way.

var x: u8 = 0;
x = x -| 1; // 0

And for Multiplication

Multiplication follows the pattern too: *, *%, and *|. The single rule, choose your overflow behavior, applies across the arithmetic operators.

const big = a *% b; // wrap on overflow

Default Builds Stay Safe

In Debug and ReleaseSafe modes, plain operators check for overflow. You only opt out where you have a real reason to wrap or saturate.

Intent Lives in the Code

Because each behavior has its own symbol, a reader sees your overflow intent at a glance. Nothing is assumed; the operator spells it out.

Quick Check

You want a u8 counter to roll over from 255 back to 0. Which operator?

Recap: Pick Your Overflow

Plain math traps, the % suffix wraps, and the | suffix saturates. Choose deliberately, and overflow is never a hidden surprise. 🛡️

常见问题解答

「溢出：+、+% 与 +|」课时是免费的吗？

是的 — 「溢出：+、+% 与 +|」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Zig Academy 课程的其余内容，请升级到 CoddyKit PRO。 Zig Academy 课程共包含 4 节课。

「溢出：+、+% 与 +|」这节课中我会学到什么？

理解陷阱式、回绕式和饱和式运算。你通过在浏览器中直接运行的动手代码来练习 Zig Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Zig Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Zig Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 2 节课，共 4 节。

「溢出：+、+% 与 +|」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Zig Academy 课中编写并运行代码吗？

能。每节 Zig Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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