You should almost always switch() on an expression rather than a constant like 'k' (which is a character vector)
switch() applied on a vector will only work if the vector is a character vector (that is, a string)
You need a loop or something like that.
function total_days = total(month,day,extra_day)
[...]
total_days = total(month,day,extra_day)
that last line would be recursive call to the function you are in.
You need to move the prompts to a different file and run that file instead of trying to run total directly.
