Reference no: EM133361856

Question:

Suppose that a class named RainXml would be used to generate the XML text for all the rain data.

class RainXml

{

public:

RainXml();

RainXml getInstance();

QString writeToXml(/*passing rain data*/);

private:

RainXml instance; bool checkStationCode(QString stn) const;

QRegularExpression re;

};

This class is supposed to be implemented using a singleton design pattern

The checkStationCode(QString stn) function from the class definition in (A) ABOVE is used to ensure that the station code meets the correct format required, where the QString parameter is the station code that needs checking. The returned Boolean is true if the code meets requirements and false otherwise.

bool RainXml::checkStationCode(QString stn) const

{

// add code here

}

The station code should meet the following requirements.

Should begin with a capital letter.
This is followed by any 2 lowercase alphabetic characters.
This is followed by the same capital letter as the initial character of the code.
The numeric part of the code is made up of any 3 digits, where the first digit cannot be zero. There should be no other characters before or after this code.
Question:

Write the QRegularExpression that would be used to check codes for correctness. QRegularExpression re(/*what would you put here*/);