Solution.java

package _007;

/**
 * <pre>
 *     author: Blankj
 *     blog  : http://blankj.com
 *     time  : 2017/04/19
 *     desc  :
 * </pre>
 */
public class Solution {
    public int reverse(int x) {
        long res = 0;
        for (; x != 0; x /= 10)
            res = res * 10 + x % 10;
        return res > Integer.MAX_VALUE || res < Integer.MIN_VALUE ? 0 : (int) res;
    }

    public static void main(String[] args) {
        Solution solution = new Solution();
        System.out.println(solution.reverse(123));
        System.out.println(solution.reverse(-123));
        System.out.println(solution.reverse(100));
        System.out.println(solution.reverse(1000000003));
    }
}