Problem 172. Test if a Number is a Palindrome without using any String Operations

@bmtran (Bryant Tran)

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Description

Given an integer X, determine if it is a palindrome number. That is, X is equal to the X with the digits reversed (with no leading 0s). The twist is that your code cannot use any function or variable name that has either "str", "eval", "flip" or "printf" in it.

Example

    X = 123454321;
    Y = true;

    X = 1234;
    Y = false;

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875 Solutions

256 Solvers

Last Solution submitted on May 12, 2026

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Problem Comments

2 Comments

Freddy on 22 Mar 2012

Nice expression for the usage test. Maybe one can add function "dec2base", cause the return type is a String.

Christian Schröder on 15 Jul 2019

The problem description should mention that dec2base isn't allowed either.

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