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PalindromeNumber.java
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54 lines (51 loc) · 1.43 KB
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/*
* Copyright (c) 2015. Sevan Joe
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.sevan.leetcode;
/**
* Created by Sevan Joe on 1/29/2015.
*/
public class PalindromeNumber {
/**
* LeetCode No.9 Palindrome Number
*
* @param x input value
* @return result
*/
public boolean isPalindrome(int x) {
if (x < 0) {
return false;
}
int digits = 1;
int temp = x;
while (temp >= 10) {
temp /= 10;
++digits;
}
int left;
int right;
int remainCount = digits / 2;
while (remainCount > 0) {
left = (x / (int) Math.pow(10, digits - remainCount)) % 10;
right = (x / (int) Math.pow(10, remainCount - 1)) % 10;
if (left == right) {
--remainCount;
} else {
return false;
}
}
return true;
}
}