golang------基本函数：常量

一、常量

常量不能被修改
常量一般定义在全局

package main
import "fmt"
func main() {
    
    
const age int = 98
fmt.Println(age)
	}
------------------------------------------------------------------------------------------
98

二、常量简写

方法一：

const age = 98

方法二：因式分解

package main
import "fmt"
func main() {
    
    
const pi = 3.1415926
	const (
		v1 = 123
		v2 = 456
		pi = 9.9
	)
	fmt.Println(v1,v2) 
	}
------------------------------------------------------------------------------------------
123 456 9.9

三、iota

package main

import "fmt"

func main() {
    
    

	const (
		v1 = iota
		v2
		v3
		v4
		v5
	)
	fmt.Println(v1,v2,v3,v4,v5)
	}
------------------------------------------------------------------------------------------
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#iota从0开始赋值

package main

import "fmt"

func main() {
    
    

	const (
		v1 = iota
		v2 = iota + 2
		v3
		v4
		v5
	)
	fmt.Println(v1,v2,v3,v4,v5)
	}
---------------------------------------------------------------------------------------
---
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