如何在GO（ - ， *， /，％， - ）中使用算術運算符？

Go語言中算術運算符的使用方法包括：1.基本運算符、-、*、/、%用於加減乘除和取餘，整數相除結果為整數，負數除法向零舍入，取餘僅支持整數；2.自增和自減--只能作為獨立語句作用於變量，不可用於表達式；3.混合類型運算需顯式轉換類型，不可直接對不同類型進行運算。例如，int與float64相加時必須先轉換為相同類型。

Using arithmetic operators in Go is straightforward, and they work pretty much like you'd expect if you've used other C-style languages. Let's go over how to use each of them effectively.

Basic Arithmetic: , -, *, /, %

These are the standard math operations you'll use most often:

• for addition
• - for subtraction
• * for multiplication
• / for division
• % for modulus (remainder after division)

Here's a quick example:

 a := 10
b := 3

fmt.Println(ab) // 13
fmt.Println(a - b) // 7
fmt.Println(a * b) // 30
fmt.Println(a / b) // 3 (since both are integers)
fmt.Println(a % b) // 1

A few things to note:

• If both operands are integers, the result will also be an integer.
• Division with negative numbers rounds toward zero.
• Modulus works only with integers in Go (unlike some other languages).

Increment and Decrement: and --

Go uses to increment by 1 and -- to decrement by 1. But unlike in C or Java, these can't be used in expressions — they're statements only.

For example:

 i := 5
i  
fmt.Println(i) // 6

j := 10
j--
fmt.Println(j) // 9

You can't do something like this:

 x := i // ❌ Compile error

So just remember:

• They only work on variables, not constants or expressions.
• They must appear on their own line as standalone operations.

Mixing Types? Be Careful!

Go doesn't allow mixing types automatically in arithmetic. For example, you can't add an int and an float64 directly — you have to convert one to match the other.

 var x int = 5
var y float64 = 2.5

// This won't compile:
// fmt.Println(xy)

// You need to convert:
fmt.Println(float64(x) y) // OK

Same goes for different integer types like int8 , int16 , etc. Always make sure your types match before doing math.

That's the core of using arithmetic operators in Go. The rules are simple, but strict — especially around type conversion and where /-- can be used.

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