大数相加

 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 
 4 int main()
 5 {
 6     string a, b, res;
 7     cin >> a >> b;
 8     int i, k, inc, lena, lenb, temp;
 9     lena = a.length(); lenb = b.length();
10     for (i = lena - 1, k = lenb - 1, inc = 0; i >= 0 || k >= 0; --i, --k)
11     {
12         temp = inc;
13         if (i >= 0)
14         {
15         temp += a[i] - ‘0‘;
16         }
17         if (k >= 0)
18         {
19             temp += b[k] - ‘0‘;
20         }
21         res += temp % 10 + ‘0‘;
22         inc = temp / 10;
23     }
24     if (inc)
25     {
26     res += inc + ‘0‘;
27     }
28     reverse(begin(res), end(res));
29     cout << res << endl;
30     return 0;
31 }