The C Standard Library will often require pointers to data. For example, when a C function requires a string, it will need a const char* pointer to the character array containing the string. The C++ Standard Library has been designed to allow you to use its classes with the C Standard Library; indeed, the C Standard Library is part of the C++ Standard Library. In the case of string objects, the solution is simple: when you need a const char* pointer, you simply call the c_str method on a string object.
The containers that store data in contiguous memory (array, string, or data) have a method called data that gives access to the container's data as a C array. Further, these containers have [] operator ...
