Data Structure Stack: Reverse a stack using recursion

http://www.geeksforgeeks.org/reverse-a-stack-using-recursion/

 1 #include <iostream>
 2 #include <vector>
 3 #include <algorithm>
 4 #include <queue>
 5 #include <stack>
 6 #include <string>
 7 #include <fstream>
 8 #include <map>
 9 #include <set>
10 using namespace std;
11 
12 void insertbottom(stack<int> &S, int top) {
13     if (S.empty()) S.push(top);
14     else {
15         int tmp = S.top();
16         S.pop();
17         insertbottom(S, top);
18         S.push(tmp);
19     }
20 }
21 
22 void reversestack(stack<int> &S) {
23     if (S.empty()) return;
24     int top = S.top();
25     S.pop();
26     reversestack(S);
27     insertbottom(S, top);
28 }
29 
30 int main() {
31     stack<int> S;
32     S.push(4);
33     S.push(3);
34     S.push(2);
35     S.push(1);
36     reversestack(S);
37     while (!S.empty()) {
38         cout << S.top() << endl;
39         S.pop();
40     }
41     return 0;
42 }