#include <iostream>
#include <string>

void PrintString(char* cstring, std::string stdstring)
{
    std::cout << cstring << std::endl;
    std::cout << stdstring << std::endl;
}

int main()
{
    char cst[] = {'a', 'n', 'a', '\0'};
    std::string stdst = "ana";
    PrintString(cst, stdst);
    cst[3] = '3';
    cst[4] = '\0';
    PrintString(cst, stdst);
    stdst.append("4");
    PrintString(cst, stdst);
}