如何在GO（ - ， *， /，％， - ）中使用算术运算符？

Go语言中算术运算符的使用方法包括：1.基本运算符 、-、*、/、%用于加减乘除和取余，整数相除结果为整数，负数除法向零舍入，取余仅支持整数；2.自增 和自减--只能作为独立语句作用于变量，不可用于表达式；3.混合类型运算需显式转换类型，不可直接对不同类型进行运算。例如，int与float64相加时必须先转换为相同类型。

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(a   b) // 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(x   y)

// 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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