#include<iostream>
using namespace std;

void Input(int &number)
{
	do
	{
		cout << "\nEnter number: ";
		cin >> number;
		if (number < 0)
		{
			cout << "Please enter again" << endl;
		}
	} while (number < 0);
}
void DecimalToBinary(int number)
{
	int binary[32];
	int i = 0;
	while (number > 0)
	{
		binary[i] = number % 2;
		number /= 2;
		i++;
	}
	cout << "Decimal to Binary: ";
	for (int j = i - 1; j >= 0; j--)
	{
		cout << binary[j];
	}
	cout << endl;
}
void DecimalToHexadecimal(int number)
{
	char hexadecimal[100];
	int i = 0, surplus;
	while (number > 0)
	{
		surplus = number % 16;
		if (surplus < 10)
		{
			surplus += 48;
		}
		else
		{
			surplus += 55;
		}
		hexadecimal[i] = surplus;
		number /= 16;
		i++;
	}
	cout << "Decimal to Hexadecimal: ";
	for (int j = i - 1; j >= 0; j--)
	{
		cout << hexadecimal[j];
	}
	cout << endl;
}
int BinaryToDecimal()
{
	char Bin[20] = { 0 };
	long int Dec = 0;
	int i = 0, n;
	cout << "\nEnter Binary number :";
	cin >> Bin;
	while (Bin[i] != '\0')
	{
		n = Bin[i] - 48;
		if ((n != 0) && (n != 1))
			return -1;
		Dec = (Dec * 2) + n;
		i++;
	}
	return Dec;
}
void BinaryToHexadecimal(int number)
{
	unsigned int hexa[32] = { 0 };
	int i = 1, j, rem, dec = 0;;
	//binary to decimal
	while (number > 0)
	{
		rem = number % 2;
		dec = dec + (rem * i);
		number /= 10;
		i *= 2;
	}
	//decimal to hexa
	i = 0;
	while (dec != 0)
	{
		hexa[i] = dec % 16;
		dec /= 16;
		i++;
	}
	cout << "Hexa Decimal valua: ";
	for (j = i - 1; j >= 0; j--)
	{
		if (hexa[j] > 9)
			cout << char(hexa[j] + 55);
		else
			cout << hexa[j];
	}
	cout << endl;
	system("pause");
	return;
}
void HexadecimalToDecimal()
{
	char Hex[17];
	long int Decimal = 0;
	int i = 0, val, len;
	cout << "Enter any Hexadecimal number: ";
	cin >> Hex;
	len = strlen(Hex);
	len--;
	for (i = 0; Hex[i] != '\0'; i++)
	{
		switch (Hex[i])
		{
		case 0:
			val = 0;
			break;
		case 1:
			val = 1;
			break;
		case 2:
			val = 2; break;
		case 3:
			val = 3; break;
		case 4:
			val = 4; break;
		case 5:
			val = 5; break;
		case 6:
			val = 6; break;
		case 7:
			val = 7; break;
		case 8:
			val = 8; break;
		case 9:
			val = 9; break;
		case 'a':
		case'A':
			val = 10; break;
		case 'b':
		case'B':
			val = 11; break;
		case'C':
		case'c':
			val = 12; break;
		case'd':
		case'D':
			val = 13; break;
		case 'E':
		case'e':
			val = 14; break;
		case 'F':
		case'f':
			val = 15; break;
		default:
			break;
		}
		Decimal += val * (pow(16, len));
		len--;
	}
	cout << "Hexadecimal to Decimal : " << Decimal << endl;
}
int main()
{
	int number;
	int selection;
	do
	{
		cout << "1: Decimal to Binary " << endl;
		cout << "2: Decimal to Hexadecimal " << endl;
		cout << "3: Binary to Decimal " << endl;
		cout << "4: Hexadecimal to Decimal " << endl;
		cout << "5: Binary to Hexadecimal " << endl;
		cout << "6: Close(0)" << endl;
		cout << "\nChoose :";
		cin >> selection;
		switch (selection)
		{
		case 1:
			Input(number);
			DecimalToBinary(number);
			break;
		case 2:
			Input(number);
			DecimalToHexadecimal(number);
			break;
		case 3:
			cout << "Binary to Deciaml : " << BinaryToDecimal() << endl;
			break;
		case 4:
			HexadecimalToDecimal();
			break;
		case 5:
			Input(number);
			BinaryToHexadecimal(number);
			break;
		default:
			break;
		}
	} while (selection > 0);
	cout << endl;
	system("pause");
	return 0;
}