計算 a + b

 1 #include <iostream>
 2 #include <algorithm>
 3 using namespace std;
 4 
 5 string sol;
 6 
 7 void solve(string a, string b){
 8     int j = b.size() - 1, i = a.size() - 1, cnt = 0;
 9     for(; i >= 0 && j >= 0; i--, j--){
10         int x = a[i] - ‘0‘;
11         int
 
 y = b[j] - ‘0‘;
12         sol += (char)((x + y + cnt) % 10 + ‘0‘);
13         cnt = (x + y + cnt) / 10;
14     }
15     while(i >= 0){
16         int x = a[i--] - ‘0‘;
17         sol += (char)((x + cnt) % 10 + ‘0‘);
18         cnt = (x + cnt) / 10;
19     }
20     while(j >= 0){
21         int y = b[j--] - ‘
 
0‘;
22         sol += (char)((y + cnt) % 10 + ‘0‘);
23         cnt = (y + cnt) / 10;
24     }
25     if(cnt) sol += ‘1‘;
26     reverse(sol.begin(), sol.end());
27 }
28 
29 int main(void){
30     string a, b;
31     cin >> a >> b;
32     solve(a, b);
33     cout << sol << endl;
34     return
 
 0;
35 }

大數加法模板