Compare_Version_Numbers.java

import java.util.*;
import java.io.*;
import java.lang.*;
public class Compare_Version_Numbers {
    class Solution {
        public int compareVersion(String version1, String version2)
        {
            int i = 0;
            int j = 0;
            while(i < version1.length() || j < version2.length())
            {
                int num1 = 0;
                int num2 = 0;
                while(i < version1.length() && version1.charAt(i) != '.')
                {
                    num1 = num1 * 10 + (version1.charAt(i++) - '0');
                }
                while(j < version2.length() && version2.charAt(j) != '.')
                {
                    num2 = num2 * 10 + (version2.charAt(j++) - '0');
                }
                if(num1 < num2)
                {
                    return -1;
                }
                if(num1 > num2)
                {
                    return 1;
                }
                i++;
                j++;
            }
            return 0;
        }
    }
}