Check out example codes for "c c_str". It will help you in understanding the concepts better.

Code Example 1

Get C string equivalent

  TL;DR	->	Makes the string end with '\0'

Returns a pointer to an array that contains a null-terminated sequence of
characters (i.e., a C-string) representing the current value of the string
object.

This array includes the same sequence of characters that make up the value of
the string object plus an additional terminating null-character ('\0') at the
end.

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