# Go 语言

# 安装

https://go.dev/dl/ 这里下载直接安装就行

验证安装

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go version

创建

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go mod init example.com/a

hello world

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	package main

	import "fmt"

	func main() {
	fmt.Println("hello world")
	}

# 变量

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	var b = 2
	var c int
	c = 2

类型

int , int8 , int16 , int32 , int64 , uint8 , uintptr
float32 , float64

# 循环

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	var a = 0
	for i := 1; i <= 5; i++ {
	a += 1
	}
	for _, v := range bank {
	}
	for i, v := range bank {
	}

# 函数

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	func f(a int,b int) int {
	return a + b
	}

# 数组

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	var a = [5]int{1, 2, 4, 5}
	var a = []int{1, 2, 4, 5} # 不定长
	var b = make([]int, 5) # 5 个元素
	b = append(b, 1, 2, 3, 4)

# map

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	var m = map[string]int{
	"a": 1,
	"b": 2,
	}
	var m = make(map[string]int)

# struct

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	type Edge struct {
	v int
	len int
	}

	func (e Edge) set(x, y int) {
	e.v = x
	e.len = y
	}
	var e = Edge{1, 2}

# 字符串

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import s "strings"

统计字符串中出现个数

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s.Count("test","t")