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《算法通关村—进制转换问题处理模板》

先来一个题热热身

504. 七进制数

输入: num = 100
输出: "202"

输入: num = -7
输出: "-10"

题解

解决这种问题都是通过取模，然后除以要转的进制位，循环直到数据为0，然后倒序输出就好，最后就是要注意0，和正负的问题了。

class Solution {public String convertToBase7(int num) {StringBuffer sb = new StringBuffer();boolean sign = num<0;if(num == 0){return "0";}while(num != 0){sb.append(Math.abs(num%7) + "");num/=7;}if(sign){sb.append("-");}return sb.reverse().toString();}}

进制处理模板

处理的方法其实差不多的。

public class NumConversionUtil {/*** 进制转换工具类* @param num* @param scale* @return*/public static String numConversionUtil(int num , int scale){String[] nums = new String[] {"1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};boolean sign = num < 0;if(sign){num*=-1;}StringBuffer sb = new StringBuffer();int temp = 0;if(num == 0){return "0";}while(num != 0){temp = num % scale;sb.append(temp + "");num/=scale;}if(sign){sb.append("-");}return sb.reverse().toString();}public static void main(String[] args) {System.out.println(numConversionUtil(0,2));}
}