CString str("HELLO WORLD"); str.MakeLower(); cout << str << endl;
CString str1("Red"); CString str2("RED"); if (str1.MakeLower() == str2.MakeLower()) { cout << "The strings match." << endl; }Output: `The strings match.` In this example, two string variables `str1` and `str2` are initialized with similar strings but different letter cases. The `MakeLower` function is called on both variables to convert them to lowercase. The `if` statement compares the lowercase versions of the strings and outputs a message if they match. The `MakeLower` function is part of the MFC (Microsoft Foundation Class) library package.