#include "stdafx.h"
#include <iostream>
#include <string>

using namespace std;

int toInt(string s, int i) {
	return stoi(string(1, s[i]));
};

int _tmain(int argc, _TCHAR* argv[])
{
	string s, v;
	int i, value;
	cout<< "Input number: ";
	cin>> s;
	value = toInt(s,0);
	for (i = 1;i < s.length(); i++) {
		switch (value) {
			case 0: case 3: case 6: case 9:
				if ((toInt(s,i) == 0) || (toInt(s,i) == 6)) value = 0;
				if ((toInt(s,i) == 1) || (toInt(s,i) == 7)) value = 1;
				if ((toInt(s,i) == 2) || (toInt(s,i) == 8)) value = 2;
				if ((toInt(s,i) == 3) || (toInt(s,i) == 9)) value = 3;
				if (toInt(s,i) == 4) value = 4;
				if (toInt(s,i) == 5) value = 5;
				break;
			case 1: case 4: case 7:
				if ((toInt(s,i) == 2) || (toInt(s,i) == 8)) value = 0;
				if ((toInt(s,i) == 3) || (toInt(s,i) == 9)) value = 1;
				if (toInt(s,i) == 4) value = 2;
				if (toInt(s,i) == 5) value = 3;
				if ((toInt(s,i) == 0) || (toInt(s,i) == 6)) value = 4;
				if ((toInt(s,i) == 1) || (toInt(s,i) == 7)) value = 5;
				break;
			case 2: case 5: case 8:
				if (toInt(s,i) == 4) value = 0;
				if (toInt(s,i) == 5) value = 1;
				if ((toInt(s,i) == 0) || (toInt(s,i) == 6)) value = 2;
				if ((toInt(s,i) == 1) || (toInt(s,i) == 7)) value = 3;
				if ((toInt(s,i) == 2) || (toInt(s,i) == 8)) value = 4;
				if ((toInt(s,i) == 3) || (toInt(s,i) == 9)) value = 5;
				break;
		}
	}
	cout<< s<< " mod 6 = "<< value<< endl;
	system("PAUSE");
	return 0;
}