#include <string>
#include <iostream>
#include <conio.h>
#include <stdlib.h>
using namespace std;
__int64 BinaryToInt(string s)
{
	__int64 ret=0;
	__int64 pow=1;
	for(int i=s.length()-1;i>=0;i--)
	{
		ret=ret+pow*(s.c_str()[i]-48);
		pow=pow*2;
	}
	return ret;
}
string ToOctal(string s)
{
	__int64 toint=BinaryToInt(s);
	string ret="";
	do
	{
		int i=toint%8;
		toint=toint/8;
		ret=(char)(i+48)+ret;
	}while(toint!=0);
	return ret;
}
string ToHex(string s)
{
	__int64 toint=BinaryToInt(s);
	string ret="";
	do
	{
		int i=toint%16;
		toint=toint/16;
		if(i>9)
		{
			ret=(char)(i-10+65)+ret;
		}
		else
		{
			ret=(char)(i+48)+ret;
		}
	}while(toint!=0);
	return ret;
}
int main()
{
	while(1)
	{
		system("cls");
		cout<<"Number Base Converter\n\n1: Binary to Octal\n2: Binary To Decimal\n3: Binary to Hexadecimal";
		char tmp=getch();
		string s;
		switch(tmp)
		{
		case '1':
			cout<<"\n\nPlease enter binary number: ";
			cin>>s;
			cout<<"Octal: "<<ToOctal(s);
			getch();
			break;
		case '2':
			cout<<"\n\nPlease enter binary number: ";
			cin>>s;
			cout<<"Decimal: "<<BinaryToInt(s);
			getch();
			break;
		case '3':
			cout<<"\n\nPlease enter binary number: ";
			cin>>s;
			cout<<"Hexadecimal: "<<ToHex(s);
			getch();
			break;
		default:
			break;
		}
	}
	getch();
	return 0;
}