大数相加

 1 #include <iostream>
 2 #include <cstring>
 3 using namespace std;
 4 int main()
 5 {
 6     int len1,len2,p;
 7     int i,j,t;
 8     char a[1000],b[1000],c[1001];
 9     cin>>t;
10     for(j=1;j<=t;j++)
11     {
12         cin>>a>>b;
13         cout<<"Case"<<" "<<j<<":"<<endl;
14         cout<<a<<" "<<"+"<<" "<<b<<" "<<"="<<" ";
15         len1=strlen(a)-1;
16         len2=strlen(b)-1;
17         p=0;
18         for(i=0;len1>=0||len2>=0;i++,len1--,len2--)
19         {
20             if(len1>=0&&len2>=0)
21                c[i]=a[len1]+b[len2]-‘0‘+p;
22             if(len1>=0&&len2<0)
23                c[i]=a[len1]+p;
24             if(len2>=0&&len1<0)
25                c[i]=b[len2]+p;
26             p=0;
27             if(c[i]>‘9‘)
28             {
29                c[i]=c[i]-10;
30                p=1;
31             }
32         }
33         if(p==1)
34            cout<<"1";
35         while(i--)
36            cout<<c[i];
37         if(j<t)
38            cout<<endl<<endl;
39         else
40             cout<<endl;
41     }
42     return 0;
43 }