数据类型转换

https://baijiahao.baidu.com/s?id=1739760578977300943&wfr=spider&for=pc

https://www.jb51.net/jiaoben/321140lr6.htm （strconv包）

• int、int64转string

  //string到int 
  int,err:=strconv.Atoi(string) 
  //string到int64 
  int64, err := strconv.ParseInt(string, 10, 64) 
  //int到string 
  string:=strconv.Itoa(int) 
  //int64到string 
  string:=strconv.FormatInt(int64,10)
  //string到float32(float64)
  float,err := strconv.ParseFloat(string,32/64)
  //float到string
  string := strconv.FormatFloat(float32, 'E', -1, 32)
  string := strconv.FormatFloat(float64, 'E', -1, 64)

• hex转int

package main

import (
    "fmt"
    "strconv"
)

func main() {
    hexStr := "1a3f"
    i, err := strconv.ParseInt(hexStr, 16, 64)
    if err != nil {
        fmt.Printf("Error: %s\n", err)
        return
    }
    fmt.Printf("The integer is: %d\n", i)
}