/* * Calculating the Euclidian distance in a 2-dimensional plane? * Perfect time to practice OOP! * * Input: (x1, y1) (x2, y2) * Enter it in a single line and notice the whitespaces. * * Examples: * (2, 2) (2, -4) -> 6 * (5, 1) (9, 4) -> 5 * (3, 3) (0, 0) -> 4,24264 */ #include #include #include #include #include using namespace std; class Point { private: double x, y; public: Point(double x, double y) { this->x = x; this->y = y; } double get_x() { return x; } double get_y() { return y; } // I decided to do this as a member function double get_distance(Point other) { double horizontal = pow(x - other.get_x(), 2); double vertical = pow(y - other.get_y(), 2); return sqrt(horizontal + vertical); } string to_string() { stringstream buffer; buffer << "(" << x << ", " << y << ")"; return buffer.str(); } }; // Overloading to cout the point without calling to_string manually ostream& operator<<(ostream& stream, Point& p) { return stream << p.to_string(); } // Creating a point from a string Point get_point(string input) { int comma = input.find(','); int x = stoi(input.substr(1, comma-1)); int y = stoi(input.substr(comma + 2, input.length() - comma - 2)); return Point(x, y); } // Seperating the input into 2 halves string parse_input(string &input) { int seperator = input.find(" ("); string second_half = input.substr(seperator + 1); input.erase(seperator); return second_half; } int main() { regex input_check("^\$-?\\d+,\\s-?\\d+\$\\s\$-?\\d+,\\s-?\\d+\$$"); string input1, input2; getline(cin, input1); try { if(!regex_search(input1, input_check)) throw "Invalid input!"; input2 = parse_input(input1); Point p1 = get_point(input1); Point p2 = get_point(input2); cout << "The distance between " << p1 << " and " << p2 << " is " << p1.get_distance(p2) << "."; } catch(const char *e) { cout << e; } return 0; }

Coding Challenge #15: Calculate the Distance