utility.cpp

#include <bits/stdc++.h>
using namespace std;

int hex_to_dec(string s)
{
	int n = s.size() - 1, pow = 0, result = 0;
	for (int i = n; i >= 0; --i)
	{
		int mul = 1;
		for (int j = 1; j <= pow; ++j)
		{
			mul *= 16;
		}
		result += char_to_int[s[i]] * mul;
		++pow;
	}
	return result;
}

string dec_to_hex(int &number)
{
	int shift_bit = 1, shifting = 8, counter = 1, dec_val = 0, mul_val = 1;
	string hex_val;
	for (int i = 0; i < shifting; ++i)
	{
		if (number & shift_bit)
			dec_val += mul_val;
		if (counter == 4)
		{
			counter = mul_val = 1;
			hex_val.push_back(int_to_char[dec_val]);
			dec_val = 0;
		}
		else
		{
			mul_val *= 2;
			++counter;
		}
		shift_bit <<= 1;
	}
	reverse(hex_val.begin(), hex_val.end());
	return hex_val;
}

string dec_to_hex16(int &number)
{
	int shift_bit = 1, shifting = 16, counter = 1, dec_val = 0, mul_val = 1;
	string hex_val;
	for (int i = 0; i < shifting; ++i)
	{
		if (number & shift_bit)
			dec_val += mul_val;
		if (counter == 4)
		{
			counter = mul_val = 1;
			hex_val.push_back(int_to_char[dec_val]);
			dec_val = 0;
		}
		else
		{
			mul_val *= 2;
			++counter;
		}
		shift_bit <<= 1;
	}
	reverse(hex_val.begin(), hex_val.end());
	return hex_val;
}