Question

A palindromic number is a number that remains the same when its digits are reversed. For examples, 1, 11, 99, 121 are palindromic. Write a program that takes one array of 10 positive integers as input and output all the palindromic numbers in this array. We assume that each input number is valid, i.e., a positive integer.

Hint: You can consider the following steps to check whether a number (e.g., 121) is palindromic • Store this number to one variable, e.g., temp = 121. • Calculate the value of the number when all the digits in temp are reversed, e.g., extracting each digit in temp from the right-hand side to left-hand side, and calculating the value at the same time. • Check whether the original value equals to this calculated value.

write it in c++

Answer 1

Answer

here we can use 10 elements of integer array for perform the task, Here we take each value in the array and stored into a temporary variable then we can reverse that integer in best method. finally reversed integer matched with corresponding array value, if it is true then it is a palidrom. so here is the code for above problem.

// C++ code for finding palidromes in a given array of elements;
#include<bits/stdc++.h> 
using namespace std;  
int main() 
{ 
    //sample input array. which contain 10 elements.
    int arr[] = {121,56,434,1,2,121,10,12,131,178}; 
    //set n as total number of elements.
    int n = 10;
    //temp is used to store temporary value of each item in array
    int temp;
    // d hold the reminder at the time of loop.
    int d;
    // rev holds the reversed value of integer.
    int rev;
    for (int i = 0; i <n; i++)  
    { 
         temp=arr[i];
         rev = 0; 
        //very important part in this, reverse an integer.
         while (temp > 0)  
         { 
                d = temp % 10; 
                rev = rev * 10 + d; 
                temp = temp / 10; 
                
         } 
         // checking the reversed integer is same as the array value. then it is palidrome.
         if(arr[i]==rev)
         {
                 cout<<rev<<"\n";
         }
    }
    return 0; 
} 

output

You can change the values of the array as you need. So here the porgram pop out the palidromes only. Any doubt please comment

Thanks in advance