这是我的程序，但是没通过，不知哪错了，
各位帮我找找
#include<iostream>
using namespace std;
int main()
{
    long a,b;
    long n[10],m[10],i,j,carry,sum,r;
    while(cin>>a>>b)
    {
        sum=0;
        if(a==0&&b==0)
            break;
        i=0;
        while(a!=0)
        {
            m[i]=a%10;
            a=a/10;
            i++;
        }
        a=i-1;
        j=0;
        while(b!=0)
        {
            n[j]=b%10;
            b=b/10;
            j++;
        }
        b=j-1;
        carry=0;
        for(i=a,j=b;i>-1||j>-1;i--,j--)
        {
            if(i>=0&&j>=0)
            {
            r=m[i]+n[j]+carry;
            if(carry=r/10)
                sum++;
            }
            else if(i>=0&&j<0)
            {
                r=m[i]+carry;
                if(carry=r/10)
                    sum++;
            }
            else
            {
                r=n[j]+carry;
                if(carry=r/10)
                    sum++;
            }
        }
        if(sum==0)
            cout<<"No carry operation."<<endl;
        else if(sum==1)
        cout<<sum<<" carry operation."<<endl;
        else
            cout<<sum<<" carry operations."<<endl;
    }
    return 1;
}