Convert char to const char*?

Question

C++ / C#

There is a string The function accepts const char* , I need to pass the first character of this string to it. The option with message[0] returns char , I'm trying to do this: But the program crashes, how can I fix it without writing extra lines of code, directly as a parameter, m?
string message = "Hello!";


(const char*)message[0];

Answer 1

There is a line
string message = "Hello!";
The function accepts const char*, I need to pass the first character of this string to it.

void f(const char *);

string message = "Hello!";
string message1(1, message[0]);
f(message1.c_str());

Answer 2

The string class usually has a c_str() method that returns a pointer to a C string.