/* This code is solution for "owl matrix challenge". Owl Matrix. An Owl Matrix is a symmetric matrix that could be "folded" vertically and horizontally in the middle and would generate four equal pieces. For Example: Input: x x x x x x x x x x x x x x x x Output: true Input: a b b a c c c c c c c c a b b a Output: true Write a program to check if the user input is an Owl Matrix or not. __________________________________________ Input instructions. For made code work well you should: 1) Press line of characters, press ENTER button. 2) If you want to add another line repeat step 1). Otherwise press SUBMIT button. __________________________________________ */ #include #include /* Base class "storage" has private: messages for display, and private method that replace action std::cout to simple pOL(message); protected containers for derrived class: that keeps collected data form user, boolean container "result" of research, integer container "size" for actual size of square matrix, and also frequantly used vector container - lines for temporary storage line of chars from user data and counting rows/columns containers i and j; public constructors, destructors, containers and methods: constructor need to create a dialog with user and collect from him, destructor simply send "bye message", boolean "approved" for validating input from user, methods for send messages input validity or result, method for showing collected data if it necessary, also created a virtual empty method for overloading it in the derrived class and using that overloaded method by the base class pointer to derrived class. */ class storage{ // There is no need to share this containers and methods with derrived class // and main program private: // messages represent as strings std::string greetings = "\nPlease, enter you matrix line-by-line here:\n\n"; std::string dataHeader = "Stored data:\n"; std::string correct = "\nThis input is correct.\n"; std::string incorrect = "\nThis input is incorrect.\n"; std::string owl = "\nYou enter an owl matrix.\n"; std::string notowl = "\nYou enter not an owl matrix.\n"; std::string bye = "\nThat's all for now, run again.\n"; std::string gorizontal = "______________\n"; // Method get message and print it void pOL(std::string message){ std::cout << message; } // Derrived class need access to this containers protected: // data from user collected in the 2-dimensional vector std::vector> data; // Result of research, "true" - matrix is "owl" bool result = true; // size of the matrix collected in the integer variable int size = 0; // temporary vector storage for rows or columns std::vector lines; // temporary container for counting rows int i = 0; // temporary container for counting columns int j = 0; // Derrived class and main program need this containers and methods public: // variable show how correct user inputed data, "true" - correct bool approved = true; // Constructor collects data from user and validate it storage(){ // temporary container for keeping line of chars from user std::string tempo; // temporary container for getting every single character // from user char temp; // set to zero temporary container for counting of matrix rows i = 0; // send greeting message to user //pOL(greetings); // do-while need to get at least one line from user do { // erase contain of lines vector lines.erase(lines.begin(), lines.end()); // get line from user std::getline(std::cin, tempo); // if line is epmty this input not valid if (tempo.empty()) approved = false; // if this first line set size to size of first line if (!i) size = tempo.size(); // if this not first line and all privious inputs // was correct check if new line correct // new line would be incorrect if it size less or bigger // than size of first line else if (approved) approved = (size == tempo.size()); // get every single character and pass to char vector for (j=0; j < tempo.size(); j++){ temp = tempo[j]; lines.push_back(temp); } // pass char vector to 2-d vector data data.push_back(lines); // add int "1" to count container, check if all lines are // already collected, also if firsdt line was empty // (it is incorrect input) stop cycle, if not continue } while (++i < size); } // Method print corresponding message // about "correct" or "incorrect" input void validateInput(){ if (approved) pOL(correct); else pOL(incorrect); } // Method show collected data from user void showData(){ // print header of user data pOL(dataHeader); pOL(gorizontal); // 2-d vector also could be managed like 2-d array for (i=0; i::iterator down = lines.begin(); std::vector::iterator up = lines.end()-1; // check sides element to the center // ther is no need to re-check after center element // also stop checking if matrix already appear not owl for (j=0; result && (j<(size/2)); j++) // using pointers to the elements // set result to "false" if matrix not owl if (*(down++) != *(up--)) result = false; } } // This methods shared with main program public: // Empty method for calling bace class validateInput() void validateInput(){} // Method for showing data void showData(){} // Method for researching matrix void researchMatix(){ // reserch every single row researchLines(true); // reserch every single column researchLines(false); } // Empty method for calling bace class closeDialog() void closeDialog(){} }; // Main program starting point int main(){ // By creating base class storage pointer to derrived class // researcher contain called base class constructor for // starting dialog with user storage *entry = new researcher; // Returning to user inputed data entry -> showData(); // Initilizing validation of input entry -> validateInput(); // Only if input was correct program go to research if (entry -> approved){ // Doing actual research entry -> researchMatix(); // Sending result to user entry -> closeDialog(); } // Finishing dialog by deleting base class pointer delete entry; return 0; }

[Challenge]: Owl matrix