#include #include // Program which splits digits into two parts. // // 4466 will become: // // 44 66 // left right // // The digits on each side will be added // together to form: // // (4 + 4) (6 + 6) // 8 12 // \ / // \ / // 812 unsigned int add_digits(const std::string& num, const size_t& num_digits, const char& left_or_right) { const size_t half = num_digits / 2; unsigned int sum = 0; /* I know that this code is redundant(?). */ if (left_or_right == 'L') { for (auto it = num.begin(), end = num.begin() + half; it != end; ++it) { const unsigned int digit = *it - '0'; if (digit > 9 || digit < 0) { throw "Can only use numeric values; i.e., 0 to 9."; } sum += digit; } } else { for (auto it = num.begin() + half, end = num.end(); it != end; ++it) { const unsigned int digit = *it - '0'; if (digit > 9 || digit < 0) { throw "Can only use numeric values; i.e., 0 to 9."; } sum += digit; } } return sum; } int main() { std::string num; std::cin >> num; std::cout << "Please enter a number: " << num << std::endl; const size_t num_digits = num.size(); try { const unsigned int left = add_digits(num, num_digits, 'L'); const unsigned int right = add_digits(num, num_digits, 'R'); std::cout << "The result is: " << left << right << std::endl; } catch (const char*& error) { std::cerr << error << std::endl; } return 0; }

Add the digits (Brain Teaser: 26-8-2019)