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算术与比较运算符

掌握核心数学和关系运算符。

算术与比较运算符 是 CoddyKit 上的免费 Zig Academy 课时。 这是第 1 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。

Math, the Zig Way

Zig gives you the everyday math operators you expect, but with one promise: nothing happens behind your back. Every operation is explicit and predictable.

The Four Basics

You add, subtract, multiply, and divide with +, -, *, and /. They read exactly like ordinary arithmetic, so simple math feels natural. 🙂

const sum = 2 + 3;
const product = 4 * 5;

Operands Must Match

Both sides of an arithmetic operator must share the same type. Zig will not silently mix an i32 with an f64 for you; you convert on purpose.

const a: i32 = 10;
const b: i32 = 3;
const c = a + b;

Integer Division Truncates

When you divide two integers, the result is also an integer and the fraction is dropped toward zero. So 7 / 2 gives you 3, not 3.5.

const half = 7 / 2; // 3

The Remainder Operator

Use % to get what is left over after division. It is perfect for checks like even-or-odd, where 10 % 2 equals 0.

const leftover = 10 % 3; // 1

Negation Flips the Sign

A single minus in front of a value negates it. Writing -x simply turns a positive number negative, and a negative one positive.

const x = 5;
const neg = -x; // -5

Comparing Two Values

Comparison operators ask a yes-or-no question and hand you back a bool. The answer is always either true or false, never a number.

const isBigger = 7 > 3; // true

Equal and Not Equal

Check sameness with == and difference with !=. These let you confirm whether two values match before you act on them.

const same = 4 == 4; // true
const diff = 4 != 5; // true

Ordering Values

The operators <, <=, >, and >= compare order. They tell you whether one value sits below, at, or above another.

const ok = 3 <= 3; // true

Comparisons Drive Decisions

Because each comparison yields a clean bool, it slots straight into an if. That is how your program chooses one path over another.

if (score > 90) {
    // top marks
}

No Hidden Conversions

Zig refuses to quietly reshape your numbers during math or comparison. This strictness keeps results exact and surprise-free as programs grow.

Quick Check

What does integer division do with the fractional part?

Recap: Operators You Own

You now wield +, -, *, /, and % for math and comparisons that return a clean bool. Everything is explicit, exact, and yours to control. 🎯

常见问题解答

「算术与比较运算符」课时是免费的吗？

是的 — 「算术与比较运算符」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。

「算术与比较运算符」这节课中我会学到什么？

掌握核心数学和关系运算符。 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 1 节课，共 4 节。

「算术与比较运算符」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。

此课程中的所有课时

  1. 算术与比较运算符
  2. 溢出：+、+% 与 +|
  3. 位运算符
  4. 布尔逻辑与短路求值
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