How to read multiple CSV files by creating function [duplicate]

Answer 1

You can use sprintf as @Andrey Shabalin suggested or as an alternative you can use formatC like so:

id <-1
formatC(id, width=4, flag="0")
[1] "0001"

In your function you have to put this line before you read-in the file:

id <- formatC(id, width=4, flag="0")

Hope this helps.