UVA Solution for 10035

#include<stdio.h>
int main()
{
    long int a,b;
    int i,r,c,carry;
    while(scanf("%ld%ld",&a,&b)==2)
    {
    if (a==0 && b==0)
    break;
   
    else
        {
             r=0;
             carry=0;
             for(i=1;i<16;i++)
             {
               if (a==0 && b==0)
               break;               
             c=(a%10)+(b%10)+r;

             if(c>9)
                    {
                        carry++;
                     r=1;      
                    }
             else
                 {
                    
                     r=0;
                 }
            
             a/=10;
             b/=10;
             }

        if(carry==0)
        printf("No carry operation.\n");
        else if(carry==1)
        printf("1 carry operation.\n");
        else
        printf("%d carry operations.\n",carry);
        }
    }
}