#include <iostream>
#include <string>

using namespace std;

void obrni( string& s )
{
	unsigned len = s.size();
	for( unsigned i=0; i < len/2; i++ ){
		char c = s[i];
		s[i] = s[len-1-i];
		s[len-1-i] = c;
		}
}

// v2
string obrni2( string s )
{
	string rezultat = s;
	unsigned len = s.size();
	for( unsigned i=0; i < len; i++ )
		rezultat[i] = s[len-1-i];
	return rezultat;
}

string FormiranjeZapisa10( unsigned x )
{
	string zapis = "";
	if( x>0 ){
		do	{
			/*
			string s=" ";
			s[0] = '0' + x%10;
			zapis = s + zapis;
			//zapis = string(char( '0' + x%10 )) + zapis;
			*/
			zapis = zapis + char((x % 10) + '0');
			x /= 10;
			}
			while( x>0 );
		obrni(zapis);
		// zapis = obrni2(zapis);
		}
	else
		zapis = "0";
		
	return zapis;
}

string FormiranjeZapisa16( unsigned x )
{
	string zapis = "";
	if( x>0 ){
		do	{
			unsigned ostatak = x%16;
			char c = ostatak < 10 
						? ostatak + '0'
						: ostatak - 10 + 'A';
			zapis = zapis + c;
			x /= 16;
			}
			while( x>0 );
		obrni(zapis);
		}
	else
		zapis = "0";
		
	return zapis;
}

string FormiranjeZapisa( unsigned x, unsigned osnova )
{
	...
}

unsigned CitanjeZapisa10( const string& s )
{
	unsigned n=0;
	for( unsigned i=0; i<s.size(); i++ )
		n = n * 10 + ( s[i] - '0' );
	return n;
}

unsigned CitanjeZapisa16( const string& s )
{
	unsigned n=0;
	for( unsigned i=0; i<s.size(); i++ ){
		char c = s[i];
		unsigned vrednostcifre = c <= '9'
			? c - '0'
			: c - 'A' + 10;
		n = n * 16 + vrednostcifre;
		}
	return n;
}

unsigned CitanjeZapisa( const string& s, unsigned osnova )
{
	...
}

void test10( unsigned i )
{
	cout << i;
	string zapis = FormiranjeZapisa10( i );
	cout << " = " << zapis;
	unsigned x = CitanjeZapisa10( zapis );
	cout << " = " << x;
	cout << endl;		
}

void test16( unsigned i )
{
	cout << i;
	string zapis = FormiranjeZapisa16( i );
	cout << " = " << zapis;
	unsigned x = CitanjeZapisa16( zapis );
	cout << " = " << x;
	cout << endl;		
}

main()
{
	for( unsigned i=0; i<=500; i+=29 )
		test16(i);
	return 0;
}