题解 | 字符串连接

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

/*
 *字符串拼接
 * */
int main() {
    string s1, s2;
    while (cin >> s1 >> s2) {
        int n1 = s1.length();
        int n2 = s2.length();
        char arr[n1 + n2];
        for (int i = 0; i < n1; i++) {
            arr[i] = s1[i];
        }
        for (int i = 0; i < n2; i++) {
            arr[n1 + i] = s2[i];
        }
        for (int i = 0; i < n1 + n2; i++) {
            cout << arr[i];
        }
        cout << endl;
    }
}