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