Uva-10035 Primary Arithmetic

#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
    unsigned long a,b,count,carry,m;
    while(scanf("%ld%ld",&a,&b)==2 && a!=0 && b!= 0)
    {
        count=0,m=0;
        while(a||b )
        {
           carry=a%10+b%10+m;
           if(carry>9){
               m=10-carry;
           count++;
           }
           a=a/10;
           b=b/10;
        }
        if(count==0)
        cout<<"No carry operation."<<endl;
        else if(count==1)
        cout<<"1 carry operations."<<endl;
        else
        printf("%d carry operation.\n",count);

    }
    return 0;
}