// Now with improved variable names. Please think carefully about the differences.struct WordData{	int frequency;	std::string word;	// We add a constructor:	WordData(int frequency, const std::string& word): frequency(frequency), word(word) {}};// Instead of a global 'library', we add the vector as a data member of the// dictionary:// class Dictionary {// 	...// 	std::vector<WordData> words;// };Dictionary::Dictionary() {	// When you are inside a member function, you don't have to specify	// that you're calling another member function. That's the default:	// C++ will look for the function inside the class first, and then	// outside.	Train();}// Don't make your class write out data. That's not its responsibility. Have it// provide data, and let the calling code write it out. Also, if you're going// to have a return value, use a meaningful one.int Dictionary::FrequencyOfFirstWord(){	// You're aware, I hope, that array indices begin at 0 in C++.	// I used .at() here so that there is some error checking: you can't	// return the frequency of the first word if there are no words.	return words.at(0).frequency;}// You don't have a meaningful value to return here, and there is nothing that// would check the return value, so don't return a value.void Dictionary::Train(){	Push_Library(4, "Apple");	Push_Library(4, "Heal");	Push_Library(2, "Heap");	Push_Library(2, "Help");	Push_Library(5, "Hello");	Push_Library(1, "xylophone");	// I assume this part is just for debugging purposes. You can still	// use your helper function for it.	std::cout << FrequencyOfFirstWord();}void Dictionary::Push_Library(int frequency, const std::string& word){	// It's really this easy:	words.push_back(WordData(frequency, word));	// Look ma, no variable.}