Compare Version Numbers

Solution

class Solution {
public:
    int compareVersion(string version1, string version2) {
    int i = 0; 
    int j = 0;
    int n1 = version1.size(); 
    int n2 = version2.size();

    int num1 = 0;
    int num2 = 0;
    while(i<n1 || j<n2)
    {
        while(i<n1 && version1[i]!='.'){
            num1 = num1*10+(version1[i]-'0');
            i++;
        }

        while(j<n2 && version2[j]!='.'){
            num2 = num2*10+(version2[j]-'0');;
            j++;
        }

        if(num1>num2) return 1;
        else if(num1 < num2) return -1;

        num1 = 0;
        num2 = 0;
        i++;
        j++;
    }

    return 0;
    }
};