蓝桥杯试题 基础练习 十六进制转八进制

题目来源：http://lx.lanqiao.cn/problem.page?gpid=T51

1、问题描述

给定n个十六进制正整数，输出它们对应的八进制数。

输入格式
　　输入的第一行为一个正整数n （1<=n<=10）。
　　接下来n行，每行一个由0~9、大写字母A~F组成的字符串，表示要转换的十六进制正整数，每个十六进制数长度不超过100000。

1.1 输出格式

输出n行，每行为输入对应的八进制正整数。

【注意】
　　输入的十六进制数不会有前导0，比如012A。
　　输出的八进制数也不能有前导0。

1.2 样例输入

2
39
123ABC

1.3 样例输出

71
4435274

---

我的答案

import java.math.BigInteger;
import java.util.Scanner;

class Main {

    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        String[] nums = new String[n];
        for (int i = 0; i < n; i++) {
            nums[i] = scanner.next();
        }
        for (int i = 0; i < n; i++) {
            BigInteger bigInteger = new BigInteger(nums[i],16);
            System.out.println(bigInteger.toString(8));
        }
    }
}

在这个位置为什么用的是BigInteger，而不是Integer。
主要是Integer能保存的位数有点小。
C9DAB2B36C这个16进制就不可以变成Integer。

更何况别人给的测试数据是这样的

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

其他的进制转化根据这个代码稍加修改就可以了。