软件大赛题目----（第十四个）十六进制转换为三进制

题目为输入一个十六进制，将其转换为三进制，解答如下

package com.bird.software; import java.util.Stack; public class TestConver { public static int sixteenToTen(String num){ num = reString(num); int sum = 0; char temp; int tempNum = 0; for(int i = 0; i < num.length(); i++){ tempNum = 0; temp = num.charAt(i); switch(temp){ case 'A': tempNum = 10;break; case 'B': tempNum = 11;break; case 'C': tempNum = 12;break; case 'D': tempNum = 13;break; case 'E': tempNum = 14;break; case 'F': tempNum = 15;break; default: tempNum = temp - '0'; } sum = (int) (sum + tempNum * Math.pow(16, i)); } return sum; } public static String reString(String temp){ if(temp.length() == 1)return temp; Stack<String> stack = new Stack<String>(); for(int i = 0; i < temp.length(); i++){ stack.push(String.valueOf(temp.charAt(i))); } StringBuffer str = new StringBuffer(); for(int i = 0; i <= stack.size()+1; i++) str.append(stack.pop()); System.out.println("-----"+str.toString()); return str.toString(); } public static String tenToThree(int num){ Stack<Integer> stack = new Stack<Integer>(); int temp; int shang = 0; while(true){ temp = num % 3; shang = num /3; stack.push(temp); if(shang < 3){ stack.push(shang); break; } num = shang; } StringBuffer sb = new StringBuffer(); for(int i = 0; i <= stack.size()+1; i++){ sb.append(stack.pop()); } return sb.toString(); } public static void main(String[] args) { System.out.print("输入十六进制F对应三进制为 "); System.out.println(tenToThree(sixteenToTen("F"))); System.out.println("---------------"); System.out.print("输入十六进制5对应三进制为 "); System.out.println(tenToThree(sixteenToTen("5"))); } }
输出结果为

输入十六进制F对应三进制为 120 --------------- 输入十六进制5对应三进制为 12