405. Convert a Number to Hexadecimal Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two's complement method is used. Note: All letters in hexadecimal (a-f) must be in lowercase. The hexadecimal string must no…

Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used. Note: All letters in hexadecimal (a-f) must be in lowercase. The hexadecimal string must not contain extra leading 0s. If the nu…

https://leetcode.com/contest/6/problems/convert-a-number-to-hexadecimal/ 分析:10进制转换成16进制,不能用库函数,刚开始,我被误导,一直到考虑负数怎么表示成补码,其实,这个系统已经帮我们做好了,计算机里面就是二进制补码表示的,我们需要做的,就是把数字表示成32位二进制,然后每四位映射成一个16进制数字,最后去掉前导0,然后就ok. 注意:不要被什么正数,负数,0,如何表示成二进制补码吸引注意力. string toHex…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 Java解法 Python解法 日期 题目地址:https://leetcode.com/problems/convert-a-number-to-hexadecimal/ 题目描述 Given an integer, write an algorithm to convert it to hexadecimal. For negative inte…

Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used. Note: All letters in hexadecimal (a-f) must be in lowercase. The hexadecimal string must not contain extra leading 0s. If the nu…

给定一个整数,编写一个算法将这个数转换为十六进制数.对于负整数,我们通常使用 补码运算 方法.注意:    十六进制中所有字母(a-f)都必须是小写.    十六进制字符串中不能包含多余的前导零.如果要转化的数为0,那么以单个字符'0'来表示:对于其他情况,十六进制字符串中的第一个字符将不会是0字符.     给定的数确保在32位有符号整数范围内.    不能使用任何由库提供的将数字直接转换或格式化为十六进制的方法.示例 1:输入:26输出:"1a"示例 2:输入:-1输出:"…

..感觉做的很蠢. 主要就是看负数怎么处理. 举个例子,比如8位: 0111 1111 = 127 1111 1111 = -1 1000 0000 = -128 正常情况1111 1111应该是256,就是最大值127+最小值的绝对值128+1+num 其实点开那个提供的WIKI链接就一目了然了.. 用LONG是怕溢出 public class Solution { char[] b = new char[16]; public String toHex(int num) { if(num =…

405. Convert a Number to Hexadecimal Easy Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used. Note: All letters in hexadecimal (a-f) must be in lowercase. The hexadecimal string mu…

Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used. Note: All letters in hexadecimal (a-f) must be in lowercase. The hexadecimal string must not contain extra leading 0s. If the nu…

Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two's complement method is used. Note: All letters in hexadecimal (a-f) must be in lowercase. The hexadecimal string must not contain extra leading 0s. If the nu…