Chapter-4/4-26.cpp

   1 /*C++ How to Program, 9/E, by Paul Deitel & Harvey Deitel.
   2
   3 Solution of exercise 4.26:
   4 (Palindrome Tester) A palindrome is a number or a text phrase that reads the
   5 same backward as forward. For example, each of the following five-digit
   6 integers is a palindrome: 12321, 55555, 45554 and 11611. Write a program that
   7 reads in a five-digit integer and determines whether or not it's a palindrome.
   8 [Hint: Use the division and remainder operators to separate the number into
   9 its individual digits.]
  10
  11 Written by Juan Carlos Moreno (jcmhsoftware@gmail.com), 2023-03-07*/
  12
  13 #include <iostream>
  14
  15 using namespace std;
  16
  17 int main()
  18 {
  19     int number, inverted_number;
  20     int first_digit, second_digit, third_digit, fourth_digit, fifth_digit;
  21     int first_remainder, second_remainder, third_remainder, fourth_remainder;
  22
  23     cout << "Enter the number: ";
  24     cin >> number;
  25
  26     first_digit = number / 10000;
  27     first_remainder = number % 10000;
  28     second_digit = first_remainder / 1000;
  29     second_remainder = first_remainder % 1000;
  30     third_digit = second_remainder / 100;
  31     third_remainder = second_remainder % 100;
  32     fourth_digit = third_remainder / 10;
  33     fourth_remainder = third_remainder % 10;
  34     fifth_digit = fourth_remainder;
  35
  36     inverted_number = fifth_digit*10000 + fourth_digit*1000 +
  37                       third_digit*100 + second_digit*10 + first_digit;
  38
  39     //It tests whether or not the number is a palindrome
  40     if (inverted_number == number)
  41     {
  42         cout << "The number is a palindrome." << endl;
  43     }
  44     else
  45     {
  46         cout << "The number is not a palindrome." << endl;
  47     }
  48
  49     return 0;
  50 }