题解 | #进制转换#

package main

import (
    "fmt"
    "bufio"
    "os"
    "strings"
    "math"
)

func main() {
    sc := bufio.NewScanner(os.Stdin)
    sc.Scan()
    s := sc.Text()
    idx := strings.Index(s,"x")
    var res int64
    var list= make([]rune,0,100) 
    for _,c := range s{
        list = append(list,c)
    }
    for i:=idx+1;i<len(list);i++{
        if list[i]>='0'&& list[i]<='9'{
            res+=int64(list[i]-'0')*int64(math.Pow(16,float64(len(list)-1-i)))
        }
        if list[i]>='A'&& list[i]<='F'{
            res+=int64(list[i]-'7')*int64(math.Pow(16,float64(len(list)-1-i)))
        }
    }
    fmt.Print(res)
}