Question

whats the difference between C Strings and C++ strings. Specially while doing dynamic memory allocation

Answer 1

I hardly know where to begin :-)

In C, strings are just char arrays which, by convention, end with a NUL byte. In terms of dynamic memory management, you can simply malloc the space for them (including the extra byte). Memory management when modifying strings is your responsibility:

char *s = strdup ("Hello");
char *s2 = malloc (strlen (s) + 6);
strcpy (s2, s);
strcat (s2, ", Pax");
free (s);
s = s2;

In C++, strings (std::string) are objects with all the associated automated memory management and control which makes them a lot safer and easier to use, especially for the novice. For dynamic allocation, use something like:

std::string s = "Hello";
s += ", Pax";

I know which I'd prefer to use, the latter. You can (if you need one) always construct a C string out of a std::string by using the c_str() method.