C++各种进制的转换

 1 /*
 2 @author:CodingMengmeng
 3 @theme:各种进制之间的转换
 4 @time:2017-1-6 21:39:08
 5 @blog:http://www.cnblogs.com/codingmengmeng/
 6 */
 7 #include <iostream>
 8 using namespace std;
 9 
10 //十进制数转换成二进制数
11 void decimal2Binary(int n)
12 {
13     if (n < 2)
14         cout << n;
15     if (n >= 2)
16     {
17         decimal2Binary(n / 2);
18         cout << n % 2;
19     }
20 }
21 
22 //十进制数转换成八进制数
23 void decimal2Octal(int n)
24 {
25     if (n < 8)
26         cout << n;
27     if (n >= 8)
28     {
29         decimal2Octal(n / 8);
30         cout << n % 8;
31     }
32 }
33 
34 //十进制转换成十六进制数
35 void decimal2Hex2(int n)
36 {
37     switch (n)
38     {
39         case 10:    cout << "A"; break;
40         case 11:    cout << "B"; break;
41         case 12:    cout << "C"; break;
42         case 13:    cout << "D"; break;
43         case 14:    cout << "E"; break;
44         case 15:    cout << "F"; break;
45         default:cout << n;
46     }
47 }
48 
49 void decimal2Hex(int n)
50 {
51     if (n < 16)
52         decimal2Hex2(n);
53     if (n>16)
54     {
55         decimal2Hex(n / 16);
56         decimal2Hex2(n % 16);
57     }
58 }
59 
60 int main(void)
61 {
62     int n;
63     cout << "input a value of n ：" << endl;
64     cin >> n;
65     cout << "the results that decimal converts to binary,octal and Hex are as follows:" << endl;
66     decimal2Binary(n);
67     cout << endl;
68     decimal2Octal(n);
69     cout << endl;
70     decimal2Hex(n);
71     cout << endl;
72 
73     getchar();
74     return 0;
75 }
运行结果：