题目：十进制转十六进制。

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		try {
			int n=Integer.parseInt(br.readLine());
			System.out.println(jinzhi_10_16(n));
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public static char getChar(int x){
		if(0<=x && 9>=x){
			return (x+"").charAt(0);
		}else{
			char c='G';
			switch(x){
				case 10: c= 'A';break;
				case 11: c= 'B';break;
				case 12: c= 'C';break;
				case 13: c= 'D';break;
				case 14: c= 'E';break;
				case 15: c= 'F';
			}
			return c;
		}
	}
	
	public static String jinzhi_10_16(int n){
		String t="";
		if(n==0) t=0+"";
		char c='0';
		while(true){
			if(n==0)break;
			c=getChar(n%16);
			t=c+t;
			n=n/16;
		}
		return t;
	}
}