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Given an Integer,write an algorithm to convert it to hexadecimal. For negative Integer, @L_615_0@method is used.
Note:
a-f) must be in lowercase.0s. If the number is zero,it is represented by a single zero character ‘0‘; otherwise,the first character in the hexadecimal String will not be the zero character.Example 1:
Input: 26 Output: "1a"
Example 2:
Input: -1 Output: "ffffffff"
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:
a-f)都必须是小写。‘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。 示例 1：
输入: 26 输出: "1a"
示例 2：
输入: -1 输出: "ffffffff"
8ms
1 class Solution { 2 var hex:string = "0123456789abcdef" 3 func toHex(_ num: int) -> String { 4 if num == 0 {return "0"} 5 var number:Int = num 6 var result:string = "" 7 var count:Int = 0 8 while(number != 0 && count < 8) 9 { 10 var index = hex.index(hex.starTindex,offsetBy: (number & 0xf)) 11 result.insert(hex[index],at: result.starTindeX) 12 //注意符号：>>= 13 number >>= 4 14 count += 1 15 } 16 return result 17 } 18 }
8ms
1 class Solution { 2 func toHex(_ num: int) -> String { 3 var result = "" 4 var map = [10:"a",11:"b",12:"c",13:"d",14:"e",15:"f"] 5 6 let base = 16 7 var tmp = num 8 9 if tmp < 0 { 10 tmp += 2 << 31 11 } else if tmp == 0 { 12 return "0" 13 } 14 15 while tmp != 0 { 16 let mod = tmp % base 17 tmp = tmp / base 18 19 if mod < 10 { 20 result = String(mod) + result 21 } else { 22 if let value = map[mod] { 23 result = value + result 24 } 25 } 26 } 27 28 return result 29 } 30 }
12ms
1 class Solution { 2 func toHex(_ num: int) -> String { 3 guard num != 0 else { 4 return "0" 5 } 6 7 let map = ["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"] 8 var result = "" 9 var num = num < 0 ? Int(UInt32.maX) + num + 1 : num 10 while num > 0 { 11 result = map[num % 16] + result 12 num /= 16 13 } 14 15 return result 16 } 17 }
12ms
1 class Solution { 2 func toHex(_ num: int) -> String { 3 let map = ["0","f"] 4 if num > 0 { 5 var temp = num 6 var res = "" 7 while temp != 0 { 8 let v = temp & 15 9 res = map[v] + res 10 temp >>= 4 11 } 12 return res 13 } else if num == 0 { 14 return "0" 15 } else { 16 var res = "" 17 for i in 0..<8 { 18 let v = num & (15 << (i*4)) 19 res = map[v>>(i*4)] + res 20 } 21 return res 22 } 23 } 24 }
16ms
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