2.1.3-pointer1.go

//++++++++++++++++++++++++++++++++++++++++
// 《Go语言高级开发与实战》源码
//++++++++++++++++++++++++++++++++++++++++
// Author:廖显东（ShirDon）
// Blog:https://www.shirdon.com/
// 知乎：https://www.zhihu.com/people/shirdonl
// 公众号:源码大数据
// 仓库地址：https://gitee.com/shirdonl/goAdvanced
// 仓库地址：https://github.com/shirdonl/goAdvanced
//++++++++++++++++++++++++++++++++++++++++

package main

import "fmt"

func main() {
	var ptr *string

	//空指针判断
	if ptr == nil { //ptr 是空指针
		fmt.Printf("ptr 的值为 : %x\n", ptr)
	}
}

//ptr 的值为 : 0