C++各种进制的转换

/*
@author:CodingMengmeng
@theme:各种进制之间的转换
@time:2017-1-6 21:39:08
@blog:http://www.cnblogs.com/codingmengmeng/
*/
#include <iostream>
using namespace std;

//十进制数转换成二进制数
void decimal2Binary(int n)
{
    if (n < 2)
        cout << n;
    if (n >= 2)
    {
        decimal2Binary(n / 2);
        cout << n % 2;
    }
}

//十进制数转换成八进制数
void decimal2Octal(int n)
{
    if (n < 8)
        cout << n;
    if (n >= 8)
    {
        decimal2Octal(n / 8);
        cout << n % 8;
    }
}

//十进制转换成十六进制数
void decimal2Hex2(int n)
{
    switch (n)
    {
        case 10:    cout << "A"; break;
        case 11:    cout << "B"; break;
        case 12:    cout << "C"; break;
        case 13:    cout << "D"; break;
        case 14:    cout << "E"; break;
        case 15:    cout << "F"; break;
        default:cout << n;
    }
}

void decimal2Hex(int n)
{
    if (n < 16)
        decimal2Hex2(n);
    if (n>16)
    {
        decimal2Hex(n / 16);
        decimal2Hex2(n % 16);
    }
}

int main(void)
{
    int n;
    cout << "input a value of n ：" << endl;
    cin >> n;
    cout << "the results that decimal converts to binary,octal and Hex are as follows:" << endl;
    decimal2Binary(n);
    cout << endl;
    decimal2Octal(n);
    cout << endl;
    decimal2Hex(n);
    cout << endl;

    getchar();
    return 0;
}

运行结果：