beginner help with switch and path

[flunkapunk]

#include <iostream>

void encode()
{
    using namespace std;
    char szInput[255] = { 0 };
    cout << "What do you want to encode?" << endl;
    cin.getline(szInput, 255);
    for(int iii = 0; iii < 255; iii++)
    {
        if((int)szInput[iii] > 64 && (int)szInput[iii] < 123)
        {
        szInput[iii] = (int)szInput[iii] + 13;
        cout << szInput[iii];
        }
        else
        cout << szInput[iii];
    }

}


int main()
{
    using namespace std;
    cout << "What do you want to do?" << endl;
    cout << "1. Encode" << endl;
    cout << "2. Decode" << endl;
    int nSel;
    cin >> nSel;
    switch(nSel)
    {
        case 1:
            encode();
            break;
        case 2:
            break;
        default:
            main();
    }

}

not complete yet, but builds with no errors. When i select 1, it executes encode() but it only prints "What do you want to encode?" and then the program doesn't go any further and finishes not giving you a chance to input anything. Could someone help?