How would I use a delimiter?
Actually, PaulS’ answer was pretty good, in that without any delimiters, your question would read “HowwouldIuseadelimiter?”
I left the other delimiter in there, because a question mark in Emglish is more than just a delimiter. It also serves to make the preceding sentence a question.
Anyway, A delimiter is just a predefined character that cannot appear in the data part of the sentence (or packet, or value, or whatever you want to call it). So, if you have control over what is sent to the Arduino, you will want to allow the Arduino to figure out what it is you’re sending. That’s why I mentioned delimiters. In the case of a whole number and a fraction, all you need is two delimiters. The first will separate the whole number from the fraction, and the second will allow the Arduino to indicate the end of that combination of values. So…
2111/16 Would serve to input the value 21 11/64.
33/4 will serve to input the value 3 3/4.