#include<iostream>
#include<string>
#include<vector>
using namespace std;

int main()
{
   string s1,s2;
   while(cin>>s1>>s2)
   {
      if(s1[0]=='0'&&s2[0]=='0') break;
      else
      {
         vector<int> v;
         v.clear();
         int count=0;
         if(s1.length()==s2.length())
         {
            for(int i=s1.length()-1;i>=0;--i)
               v.push_back((int(s1[i])-int('0'))+(int(s2[i])-int('0')));
            for(int i=0;i<s1.length()-1;++i)
               if(v[i]>9)
               {
                  v[i+1]+=1;
                  ++count;
               }
            if(v[v.size()-1]>9) ++count;
         }
         if(s1.length()>s2.length())
         {
            int l=s1.length()-s2.length();
            for(int j=s2.length()-1;j>=0;--j)
               v.push_back((int(s1[j+l])-int('0'))+(int(s2[j])-int('0')));
            for(int j=l-1;j>=0;--j)
               v.push_back(int(s1[j])-int('0'));
            for(int j=0;j<v.size()-1;++j)
               if(v[j]>9)
               {
                  ++count;
                  v[j+1]+=1;
               }
            if(v[v.size()-1]>9) ++count;
         }
         if(s2.length()>s1.length())
         {
            int l=s2.length()-s1.length();
            for(int j=s1.length()-1;j>=0;--j)
               v.push_back((int(s2[j+l])-int('0'))+(int(s1[j])-int('0')));
            for(int j=l-1;j>=0;--j)
               v.push_back(int(s2[j])-int('0'));
            for(int j=0;j<v.size()-1;++j)
               if(v[j]>9)
               {
                  ++count;
                  v[j+1]+=1;
               }
            if(v[v.size()-1]>9) ++count;
         }
         if(count==0) cout<<"No carry operation.\n";
         else
         {
            if(count==1) cout<<"1 carry operation.\n";
            else cout<<count<<" carry operations.\n";
         }
      }
   }
}
因为这题要用到高精度啊

#include <iostream.h>
#include <string.h>

void change(int num[],char str[])
{
    num[0]=strlen(str);
    for(int i=1;i<=num[0];i++)
    {
        num[i]=str[num[0]-i]-'0';
    }
}

int main()
{
    
    char str1[12],str2[12];
    while(cin >> str1 >> str2)
    {
        if(strcmp(str1,"0")==0 && strcmp(str2,"0")==0)break;
        int carry(0),i;
        int a[12]={0},b[12]={0},c[12]={0};
        change(a,str1);
        change(b,str2);
        for(i=1;i<=(a[0]>b[0]? a[0]:b[0]);i++)
        {
            c[i]+=a[i]+b[i];
            if(c[i]>9)
            {
                carry++;
                c[i+1]+=c[i]/10;
                c[i]%=10;
            }
        }
        if(c[i]==0)c[0]=i-1;
        else c[0]=i;
        if(carry==0)cout << "No carry operation." << endl;
        else if(carry==1)cout << "1 carry operation." << endl;
        else cout << carry << " carry operations." << endl;
    }
    return 0;
}