// con1.cpp : Defines the entry point for the console application.
//

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

using namespace std;

int main()
{
	int inputNum, digit, _8ToThePower_i = 1, decimalEquiv = 0;
	int digitErrorFlag = 0;

	cout << "Enter an integer number in base 8:";
	cin >> inputNum;

	while (inputNum > 0) {
		digit = inputNum % 10;
		inputNum /= 10;
		cout << digit << " : ";
		if (digit >= 8) {
			cout << "Error! There's an invalid digit " << digit << endl;
			digitErrorFlag = 1;
			break;
		}
		cout << " 8^i = " << _8ToThePower_i;
		int ithTerm = _8ToThePower_i * digit;

		cout << " ith term = " << ithTerm << endl;
		_8ToThePower_i *= 8;

		decimalEquiv += ithTerm;
	}

	if (digitErrorFlag == 0)
		cout << "The decimal equivalent is : " << decimalEquiv << endl;

	return 0;
}