Answer to Question #180096 in C++ for saif islam

Question

Create a class: “Palindrome” with private data members: upper_limit (int), lower_limit (int) and parameterized constructor, which initializes the values of both data members. Apart from initialization, this constructor also displays the count of palindrome numbers from upper_limit to lower_limit. [Example: upper_limit:50, lower_limit:10, count of palindrome numbers is: 4(11 , 22, 33 and 44), also make sure the value of upper_limit should be greater than lower_limit]. 

Answer 1

#include <iostream>
#include <vector>


class Palindrome {
public:
    Palindrome(int up, int low)
        : upper_limit { up }
        , lower_limit { low }
    {
        if(upper_limit <= lower_limit) {
            std::cout << "Upper limit is lesser than lower one!";
        }
        else {
            auto palindroms = GetPalindroms();
            std::cout << "Count of palindrome numbers is: " << palindroms.size() << '(';
            for(auto x: palindroms) std::cout << " " << x;
            std::cout << " )\n";
        }
    }


    bool IsPalindrom(int x) const {
        std::vector<int> digits;
        while(x) {
            digits.push_back(x % 10);
            x /= 10;
        }     
        for(size_t i = 0, j = digits.size() - 1; i < j; i++, j--) {
            if(digits[i] != digits[j]) return false;
        }
        return true;
    }


    std::vector<int> GetPalindroms() const {
        std::vector<int> palindroms;
        for(int i = lower_limit; i <= upper_limit; i++) {
            if(IsPalindrom(i)) {
                palindroms.push_back(i);
            }
        }
        return palindroms;
    }
private:
    int upper_limit;
    int lower_limit;
};
int main() {


    Palindrome p(50, 10);
   
    return 0;
}