题解 | #进制转换#

package main

import (
	"fmt"
	"math/big"
	"strings"
)

func hexToDec(hexStr string) *big.Int {
	// 去除可能存在的0x前缀
	hexStr = strings.TrimPrefix(hexStr, "0x")

	// 将十六进制字符串转换为大整数
	dec := new(big.Int)
	dec, ok := dec.SetString(hexStr, 16)
	if !ok {
		fmt.Println("Invalid hexadecimal input")
		return nil
	}

	return dec
}

func main() {
	var hexStr string
	fmt.Scanln(&hexStr)

	// 将十六进制字符串转换为十进制表示
	dec := hexToDec(hexStr)
	if dec != nil {
		fmt.Println(dec.String())
	}
}