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i can't resolve the problem in this code. plz anyone help viewing my error and what should i do to resolve.

// Primary arithmatic wa
#pragma warning (disable: 4786)
#include<stdio.h>
#include<iostream>
#include<string.h>
#include<algorithm>

using namespace std;

int main()
{
long int x,y;


while(cin>>x>>y)
{
if(x==0&& y==0)break;
int carry=0,sum=0;
bool flag=false;

while(x%10||y%10) // suppose ...