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newvar count=1;

function main()
{
    title "File Test";
    newvar ret=1;

    do until ret <> 1;
        dowrite("a");
        screenput "Done.  Append more text? ";
        ret = getyn();    
        screen;
    loop

    screenput "Done";
}

function getyn();
{
    newvar temp;
    screenin temp;
    getyn = 0;
    if lcase(temp) = "y" then
        getyn = 1;
    elseif lcase(temp) = "yes" then
        getyn = 1;
    endif
}

function dowrite(mode)
{
    newvar f;
    f = f_open("C:\output.txt", "a");
    f_out(f, "This is line " & count);
    f_close(f);
    count++;
}