Converts from dec to other numeral systems

numsystems.cpp

#include <iostream>
#include <assert.h>
const int NUM_SYSTEM = 2;
char arr[] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P','Q','R','S','T','U','V','W', 'X','Y', 'Z' };

char* DecToNumSystem(unsigned int num)
{
	assert(NUM_SYSTEM > 1);
	int size = std::floor(log(num) / log(NUM_SYSTEM)) + 1;
	char* res = new char[size];
	res[size] = '\0';
	int i = size - 1;
	while (num > 0) {
		res[i] = arr[num % NUM_SYSTEM];
		num /= NUM_SYSTEM;
		--i;
	}
	return res;
}

int main()
{
	std::cout << DecToNumSystem(16222122) << std::endl;
	return 0;
}