编写一个进制转换器

#include
#include
#include
using namespace std;

void BtoD(int B, int &D, int &W)//二转十
{
	int bit;
	if (B > 0)
	{
		bit = B % 10;
		D = D + bit*(int)(pow(2, float(W)));//取余，最低位是否是1
		B = B / 10;
		W++;//去掉最低位
		BtoD(B, D, W);//二进制码每一位对应权重加1

	}
}
void main()
{
	char bi[255];//二进制数内存
	int input;//输出进制数
	char type;//输出进制类型
	char contin;//标志是否继续进行
	int de = 0;//十进制数
	int weight = 0;//二进制码最低位权重
	do
	{
		cout << "请选择输入数的进制类型" << endl;
		cout << "B-二进制   O-八进制   D-十进制     H-十六进制" << endl;
		cout << "选择进制为: ";
		cin >> type;
		switch (type)
		{
		case 'B':
				cout << "输入的二进制数: ";//二转为十进制
				cin >> input;
				BtoD(input, de, weight);
				cout << "其八进制数是:" << oct << de << endl;
				cout << "其十进制数是:" << dec << de << endl;
				cout << "其十六进制是:" << hex << de << endl;
				break;
		case'O':
			cout << "输入的八进制数: ";//八进制转换为二进制
			cin >> oct >> input;
			cout << "其二进制数是: ";
			itoa(input, bi, 2);
			cout << bi << endl;
			cout << "其十进制数是:" << dec << input << endl;
			cout << "其十六进制数是:" << hex << input << endl;
			break;
		case'D':
			cout << "输入的十进制数: ";//十进制转换为二进制
			cin >> dec >> input;
			cout << "其二进制数是: ";
			itoa(input, bi, 2);
			cout << "其八进制数是: " << oct << input << endl;
			cout << "其十六进制数是: " << hex << input << endl;
			break;
		case'H':
			cout << "输入的十六进制数: ";//十六进制转换为二进制
			cin >> hex >> input;
			cout << "其二进制数是: ";
			itoa(input, bi, 2);
			cout << bi << endl;
			cout << "其八进制数是: " << oct << input << endl;
			cout << "其十进制数是: " << dec << input << endl;
			break;
		default:
			cout << "选择进制类型错误\n";
			exit(-1);


		}
		cout << "是否继续进行转换？  Y-是，N-否" << endl;
		cin >> contin;
	} while (contin == 'Y');
}