《算法竞赛入门经典》（刘汝佳）——高精度计算（基础）

#include<stdio.h>
#include<string.h>
#define ll long long 
int main()
{
    ll a,b,aa,bb;
    while(scanf("%lld%lld",&a,&b)!=EOF)
    {
        if(a==0&&b==0)break;
        aa=a>b? a:b;
        bb=a<b? a:b;
        ll jin=0,ans=0;
        while(bb)
        {
            if(jin)
                ans++;
            ll c=aa%10;aa/=10;
            ll d=bb%10;bb/=10;
            jin=(jin+c+d)/10;
        }
        while(aa)
        {
            if(jin)
                ans++;
            ll c=aa%10;aa/=10;
            jin=(jin+c)/10;
        }
        if(jin)
            ans++;
        if(ans==0)
            printf("No carry operation.\n");
        else if(ans==1)
            printf("1 carry operation.\n");
        else 
            printf("%d carry operations.\n",ans);
    }
    return 0;
}