Up until now, we have only used literal strings; characters surrounded by double quotes; we have only used them in cout statements:
cout << "Enter an expression" << endl;
We have not assigned a string to a variable, nor have we entered strings via the cin statement.
C++ doesn't have a built-in string type; recent implementations of the language do provide a String class, but not all compilers support this
Turbo C++ (the version we are using) doesn't support Strings (very well)
Before C++ had Strings, arrays of char were used to implement strings; all compilers support this method of dealing with strings
There are many library functions specifically designed to handle character arrays (strings) easily and efficiently
All implementations of C++ support these types of strings; they are commonly called NULL terminated strings to distinguish them from the more recent String type