#include <iostream>

int main() {

    char test[] = "Hellóóóó"; // test[10] won't compile. Use test[13] or just test[]

    std::cout << "The string " << test << " consists of " << sizeof test << " bytes: ";
    for(std::size_t n = 0; n < sizeof test; ++n)
        std::cout << std::hex << +(unsigned char)test[n] << ' ';
        
    std::cout << '\n';
}