大整数加法

 1 #include<iostream>
 2 #include<string>
 3 using namespace std;
 4 int main(){
 5 //高精度加法 
 6     string a,b,c;
 7     int h;
 8     cin>>a>>b;
 9     if(a.length()<b.length()){
10         c=a;
11         a=b;
12         b=c;
13     }
14     //cout<<a[0]<<endl<<b[0]<<endl;
15     h=a.length();
16     int s[h+5]={0};
17     int s1,s2; 
18     for(int i=0;i<b.length();i++){
19         s1=b[b.length()-1-i]-‘0‘;
20         s2=a[a.length()-1-i]-‘0‘;
21         s[i]=s1+s2;
22 //        cout<<i<<" "<<s[i]<<endl;
23     }
24     for(int j=b.length();j<a.length();j++){
25         s2=a[a.length()-1-j]-‘0‘;
26         s[j]=s2;
27 //        cout<<j<<" "<<s[j]<<endl;
28     } 
29     for(int i=0;i<a.length();i++){
30         if(s[i]>9){
31             s[i+1]=s[i+1]+1;
32             s[i]=s[i]-10;
33         }
34     }
35     int hs=h+3;
36     while(s[hs]==0)hs--;
37     for(int i=hs;i>=0;i--){
38         cout<<s[i];
39     }
40     return 0;
41 }