Representing data using Qt's core classes

Probably the most common Qt core class you'll run into is QString, Qt's container class for character strings. It has similar capabilities to the C++ STL class, std::wstring. Like wstring, it's multibyte. You can construct one from a traditional C-style char * string or another QString.

QString has lots of helper methods, some of which are as follows:

• append: This appends one QString class onto another
• arg: This is used to build up formatted strings (instead of sprintf)
• at and operator[]: These you can use to access a single character in the QString
• operator==, operator!=, operator<, operator>, operator<=, and operator>=: These compare two QStrings
• clear: This empties a QString and sets it to the null string
• contains: This searches one string for another string or a regular expression
• count: This counts the occurrences of a substring or character in a QString
• startsWith and endsWith: These return true if a QString starts...