Check if number is a palindrome without using modulus operator – Computer Sir Ki Class


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Solved Problem #CPP#3581 siteicon   siteicon   siteicon  

Problem Statement - Check if number is a palindrome without using modulus operator

Write a C++ program to collect a positive integer from the user and the check its reversed number would be a palindrome or not (same number when reversed for e.g. 121, 1331). Please use some alternate technique to find remainder instead of modulus operator.


TC++ #3581

Alternate (?) :   Related (?) :

Run Output

Enter a positive integer:1331


Enter a positive integer:1321
Not Palindrome

This loop reverses the number kept in nc, the copy of original number in a variable named nr.  First nc%10 extracts the last digit then this digit is shifted left by mutiplying it to 10 and then adding the next number, then last number is dropped by using nc/10.

if(n==nr) cout<<“Palindrome”; else cout<<“Not Palindrome”;
If original number n is same is nr the reversed number then we display it as palindrome, else we display not  a palindrome.


This approach will not work on negative integers. One can find absolute number of input to remove the negative sign and then follow this approach.

Suggested Filename(s): palindrome-num.cpp, palin.cpp


sunmitra| Created: 24-Feb-2018 | Updated: 29-Nov-2018|

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