A full C++ program includes a function that takes as a parameter an integer, and returns the number of odd and even digits.

EvenOddFull.cpp

// www.abukhleif.com
#include <iostream>
using namespace std;
void EvenOdd (int num, int& evens, int& odds) {
	evens = odds = 0;
	while (num != 0) {
		if (num % 2 == 0)
			evens++;
		else
			odds++;
		num /= 10;
	}
}
int main() {
	int number, evenNums, oddNums;
	number = -123456789;
	EvenOdd(number, evenNums, oddNums);
	cout<<"There are (" << evenNums << ") even digits and ("
		<< oddNums << ") odd digits in the number ("
		<< number <<").";
	return 0;
}