20 August "Problem of the Day" Answer

                                                                   GeeksforGeeks
                                                           
The Question is :- "Sum of two large numbers"
Answer :-

class Solution {
  public:
    string findSum(string X, string Y) 
    {
        if(X.length()<Y.length())
        {
            int n=Y.length()-X.length();
            for(int i=0;i<n;i++)
            {
                X='0'+X;
            }
        }
        else if(X.length()>Y.length())
        {
            int n=X.length()-Y.length();
            for(int i=0;i<n;i++)
            {
                Y='0'+Y;
            }
        }
        int carry=0,n=X.length();
        string ans;
        for(int i=n-1;i>=0;i--)
        {
            int num1=X[i]-'0',num2=Y[i]-'0';
            int sum=carry+num1+num2;
            int sum1=sum%10;
            carry=sum/10;
            char digit='0'+sum1;
            ans=digit+ans;
        }
        if(carry>0)
        {
            char car='0'+carry;
            ans=car+ans;
        }
        int isDigit=-1;
        string finalAns;
        for(int i=0;i<ans.length();i++)
        {
            if(ans[i]!='0' || i==n-1)
            {
                isDigit=i;
                break;
            }
        }
        for(int i=isDigit;i<ans.length();i++)
        {
            finalAns=finalAns+ans[i];
        }
        return finalAns;
    }
};  

Hope you understand the answer, and complete it.
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