Number Convertor

#include <iostream>
#include <windows.h>

using namespace std;

void convert(int decimal) {
	int deci1 = decimal, deci2 = decimal, deci3 = decimal;
	string binary, octal, hexa;
	
	while (deci1 > 0) {
//		to binary
		binary = to_string(deci1 % 2) + binary;
		deci1 = deci1 / 2;
		
//		to octal
		if (!deci2 == 0) {
			octal = to_string(deci2 % 8) + octal;
			deci2 = deci2 / 8;
		}
		
//		to hexadecimal
		if (!deci3 == 0) {
			int hexcode = deci3 % 16;
			if (hexcode >= 10) {
				string alpha[6] = {"A", "B", "C", "D", "E", "F"};
				hexa = alpha[hexcode - 10] + hexa;
			} else {
				hexa = to_string(deci3 % 16) + hexa;
			}
			deci3 = deci3 / 16;
		}
	}
	
	cout << "\nBinary: " << binary;
	cout << "\nOctal: " << octal;
	cout << "\nHexadecimal: " << hexa << endl;
}

int main() {
	int decimal;
	char choice;
	
	do {
		cout << "Enter decimal number: ";
		cin >> decimal;
		convert(decimal);
		cout << "\n-----------\n";
		cout << "Convert again? [y/n]: ";
		cin >> choice;
		if (choice != 'y') break;
		system("cls");
	} while (true);
	
	return 0;	
}