By "string" do you mean std::string or a character array?

Character array:
char *str = new char[1234]; Just replace 1234 with the desired length, which can be a variable.

you cannot dynamically change the size of an array, you can only create a new one and copy the old array, but i gues you could use poiters for you array holder like Ancient Dragon suggested, but thats tricky to manage, an easier option would be to use c++ vector to hold your dynamic array of strings. depending on whether all you'll do is to iterate through the list without, you could consider using a linked list array.

Hope this helps you more than confuse you.