10035 - Primary Arithmetic

/***

            Bismillahir Rahmanir Rahim
            Read the name of Allah, who created you!!!
            Author : Shah Newaj Rabbi Shishir
            Department of CSE, City University, Bangladesh.

***/

#include <bits/stdc++.h>
using namespace std;

#define sf scanf
#define pf printf
#define fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#define scase sf ("%d",&tc)
#define sn sf ("%d",&n)
#define whilecase while (tc--)
#define eof while (cin >> n)
#define forloop for (pos=1; pos<=tc; pos++)
#define arrayloop (i=0; i<n; i++)
#define cinstr cin >> str
#define getstr getline (cin,str)
#define pcase pf ("Case %d: ",pos)
#define pii pair <int,int>
#define pb push_back
#define in insert
#define llu unsigned long long
#define lld long long
#define U unsigned int
#define endl "\n"

const int MOD = 1000000007;
const int MAX = 1000005;

int main (void)
{
    /*
    freopen ("input.txt","r",stdin);
    freopen ("output.txt","w",stdout);
    */

    int len,i,d,c,carry,sum;
    string a,b;

    while (cin >> a >> b)
    {
        string x;

        if (a == "0" && b == "0")
            break;

        if (a.length() > b.length())
        {
            d = a.length()-b.length();

            while (d--)
                x += "0";

            b = x + b;
        }
        else if (a.length() < b.length())
        {
            d = b.length()-a.length();

            while (d--)
                x += "0";

            a = x + a;
        }

        len = a.length(), c = carry = 0;

        for (i=len-1; i>=0; i--)
        {
            sum = (a[i]-'0') + (b[i]-'0') + carry;

            if (sum >= 10)
            {
                ++c;
                carry = 1;
            }
            else
                carry = 0;
        }

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

    return 0;
}