C++ String Rotation

#include "stdafx.h"
#include <iostream>

using namespace std;

void Rotate(string s, int len);

int main() {
char s[20];

// Input
cout << "Enter string: "; cin >> s;
string t = s;

if (t.length() != 0)
{
cout << "\n------------\n";
Rotate(t, t.length());
cout << "\n------------";
}
else
cout << "Missing input!";

getchar(); getchar();

return 0;
}

void Rotate(string s, int len)
{
static int i = 0;
cout << "\"";

for (int j = i; j<len; ++j)
{
cout << s.at(j);
}

for (int k = 0; k<i; ++k)
{
cout << s.at(k);
}
cout << "\"";
i++;

if (i<len)
{
cout << endl;
Rotate(s, len);
}
}

Output