Getting error sound without including any?

Question

I'm following a book and currently learning about pointers and such however when i run this code i also get a wierd error sound. It's kinda cool that it does but i don't know why it's called and the book didn't say anything about (possibly cause the book is decently old now). The sound occurs when i call for 'ErrorMessage'. Is that some kind of easter egg cause i don't remember including any audio libaries?

#include <iostream>

ErrorMessage(char* msg)
{
    std::cout << "\aError:" << msg << std::endl;
}

int main()
{
    char* ep = "Invalid Input";

    ErrorMessage(ep);

    char msg[] = "Disk Failure";

    ErrorMessage(msg);

    ErrorMessage("Timeout");
}

Answer 1

Its because of

 std::cout << "\aError:" << msg << std::endl;

Notice that \a.
\a is an escape character which is audible alert which is generating that sound

Answer 2

You have used an escape sequence when you've typed that backslash in your std::cout literal.

\a is a very old-fashioned way of sending a beep signal to your terminal (called the BEL character), assuming your console (i.e. the thing that you used to launch your application) supports beeping.