#include <iostream>
#include <algorithm>
#include <numeric>
#include <locale>
int main()
{
setlocale(LC_ALL, "");
char arr[] = "0123xxx##yyy#zzz";
const size_t N = strlen(arr);
std::cout << "Сумма кодов: " << std::accumulate(arr, arr+N, 0) << std::endl;
const size_t signs = std::count(arr, arr+N, '#');
std::replace(arr, arr+N, '#', 'A');
std::cout << "Количество #: " << signs << std::endl;
std::cout << "После преобразования: " << arr << std::endl;
return 0;
}