C++ program to check whether a number is palindrome or not?

what is a palindromic number?

A palindromic number is a number which remains same when its digits are reversed. Example 121,16461 etc.

Let understand the algorithm of the program.

Input=number
reverse_number=0;
temp=number;
while loop number > 0

(a)multiply reverse_number by 10 and add remainder    of number divide by 10 to reverse_number
   reverse_number= reverse_number*10+number%10;

(b)divide number by 10
   number=number/10;

if(rev_num==temp)
print number is palindrome
else
print number is not palindrome

exit;

In the above program, we store the number in temp then reverse the number and at last, we compare the reversed number with temp.

program:-

#include<iostream>
using namespace std;
int main()
{
 int num,temp,rev_num=0;

 cout<<"Enter the  number:";
 cin>>num;
 temp=num;
 while(num>0)
 {
  rev_num=rev_num*10+num%10;
  num=num/10;
 }
 if(rev_num==temp)
     cout<<"number is palindrome";
  
 else
     cout<<"number is not palindrome";

 return 0;
}

output:-

Enter the number:3456
number is not palindrome

Enter the number:121
number is palindrome

Program to print palindrome number between 1 to 50:-

#include<iostream>
using namespace std;
int main()
{
    int n,num,sum,temp;
    cout<<"palindrome numbers are:";
for(num=1;num<=50;num++)
{
    temp=num;
    sum=0;
while(temp)
{
    n=temp%10;
    temp=temp/10;
    sum=sum*10+n;
}
if(num==sum)
    cout<<"\t"<<num;
}
return 0;
}

Output:-

palindrome numbers are: 1  2  3  4  5  6  7 
8  9  11  22  33  44