LW4 asc/desc sort

#include <iostream>
using namespace std;

int main()

{
	int num, digit, checker = 0, a = 0;

	cout << "Enter an interger: ";
	cin >> num;

	do
	{
		digit = num % 10;

		if (digit < checker)
			a = 1;

		checker = digit;
		num = num / 10;

	} while (num != 0);

	if (a == 0)
		cout << "The numerals are sorted in ascending order from right to left - nice =)\n\n";
	else
		cout << "The numerals are not sorted in ascending order from right to left - not nice at all =(\n\n";

	return 0;
}