Why won't this C++ program work?

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C++

What I want in my program is instead of

cout << "Text";

which prints out: Text, I want another command like cout << that will print out each character as a shortcut instead of

char str[] = "Hello world!";
    int i = 0;
    
    while (str [i] != '\0')
    {
        cout << str[i++] << ' ';
        cout.flush();
        usleep (100000);
        cout << ' ';
    }

So i can set str to a variable and easly access, or some other shorter way to do so.

~Thanks!

What I have tried:

#include <unistd.h>
#include <iostream>
#include <string>
using namespace std;

int main ()
{
    char str[] = "Hello world!";
    int i = 0;
    
    while (str [i] != '\0')
    {
        cout << str[i++] << ' ';
        cout.flush();
        usleep (100000);
        cout << ' ';
    }
    return 0;
}

and

int main ()
{
    
    char str[] = "Hello world!";
    int i = 0;
    
    while (str [i] != '\0')
    {
        cout << str[i++] << ' ';
        cout.flush();
        usleep (100000);
        cout << ' ';
    }
    str [] = "Hello world2!";
    return 0;
}

This one returns an error.