// This program expects a number to process. // C++ code for this question by @Bykah // https://www.sololearn.com/Discuss/729494/?ref=app //Replace first and last digit of the number //Make an application that replaces the first and //last digit of the entered integer. Try to //implement without array or list. #include #include #include // ******************** main ******************** // // The main entry point of the program to swap the // first digit with the last digit of an integer. // // Arguments // Nothing. // // Returns // A zero. int main() { int number; // Users number int lastDigit; // Last digit of number int nextDigit; // Current digit of number int place = 1; // Digit placement int temp; // Temporary number being split int result = 0; // Swapped result std::string input; // User input bool valid; // True, when input is valid int i; // Index through input // Prompt for and read an integer. std::cout << "Enter a number: "; getline(std::cin, input); // Check each character of the input to be sure a // number was entered and if the input isn't valid, // complain. for (valid = !input.empty(), i = 0; valid && i < input.length(); i++) { valid = (input[i] >= '0' && input[i] <= '9') || (i == 0 && input[0] == '-'); } // for if (!valid) { std::cout << std::endl << "Invalid entry!" << std::endl; // Otherwise, we have some kind of number so // process it. } else { // valid // Grab the number and if negative or single // digit, leave the number alone. std::stringstream(input) >> number; if (number < 10) { result = number; // Otherwise, it's a positive multiple digit // number so swap the first and last. } else { // number >= 10 // Grab the last digit and remove it from the // number holding it temporary. lastDigit = number % 10; temp = number / 10; // While the temporary number is greater than // zero, process the next digit. while (temp > 0) { // Grab the next digit, remove it from the // temporary, and keep track of the // placement so we can swap at the end. nextDigit = temp % 10; temp = temp / 10; place *= 10; // If we finally found the first digit, // it goes in the ones column, shift the // last digit to the first column, and add // both to the result. if (temp == 0) { result += lastDigit * place + nextDigit; // Otherwise, we have one of the middle // digits so shift it back to it's rightful // place and add it to the result. } else { // temp != 0 result += nextDigit * place; } // if } // while } // if // Output the number and result std::cout << number << " -> " << result << std::endl; } // if return 0; } // main

Bykah cswap og