If no need nang i save yung total sales or ordered coffee, simplehan mo na lang, using printf/scanf lang,
1. just display the items using printf with selection options (A,B,C,D)
2. then mag scanf ka and accept mo yung input , and from there validate mo ,
lagyan mo rin ng much detailed kumbaga multi level , yung question mo ,
1. start ka if coffee / tea / cocoa
2. hot / cold
3. additional items
most probably simple lang siguro hinihingi ng teacher mo, kaya simplehan mo lang ang importante dyan, maintindihan mo ang codes & logic , wag na masyado sa design,