decimal to hexadecimal,binary and octonary.

Here is a simple algorithm about 'decimal' to 'dexadecimal',and the implementation code:

 1 /*
 2 Convert from decimal to binary,octonary and hexadecimal.
 3 */
 4 package kju.decto;
 5 
 6 import kju.print.Printer;
 7 public class DecimalTo {
 8     public static String decToHex(int num) {
 9         return transDec(num, 15, 4);
10     }
11 
12     public static String decToBinary(int num) {
13         return transDec(num, 1, 1);
14     }
15 
16     public static String decToOctonary(int num) {
17         return transDec(num, 7, 3);
18     }
19 
20     /*transform decimal to others.
21     num: the input decimal.
22     base: the value to be '&'(bitwise AND) operate with 'num' for each shift operation.
23     offset:the number to shift each time.
24     */
25     private static String transDec(int num, int base, int offset) {
26         if(num == 0)
27             return "0";
28         char[] csRef = getHexTable();
29         char[] csStorage = new char[32];    //store the result(32 is the max length).
30         int pos = csStorage.length;    //position to store in the 'scStorage'.
31         while(num != 0) {
32             int temp = num & base;
33             csStorage[--pos] = csRef[temp];
34             num >>>= offset;
35         }
36         return String.valueOf(csStorage, pos, csStorage.length - pos);
37     }
38     
39     //table that contains each item of hexadecimal letter.
40     private static char[] getHexTable() {
41         return new char[]{'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
42     }
43 
44     public static void main(String[] args) {
45         String result = decToHex(60);
46         Printer.println(result);
47         //prints:3C.
48         Printer.printHr();
49         result = decToBinary(-6);
50         Printer.println(result);
51         //prints:11111111111111111111111111111010.
52         Printer.printHr();
53         result = decToOctonary(30);
54         Printer.println(result);
55         //prints:36
56     }
57 }

 

 Rre:　　Some relevant operations.

posted @ 2014-03-03 23:59  wonkju  阅读(455)  评论(0)    收藏  举报