Answer 1

lets say you are at an automated restaurant where the card is generated based on your preferences!
you have 3 options to choos

option 0 i eat everything
option 1 i am vegetarian who eats fish
option 2 i am hardcore vegan

now to print only the items a person is interessted in we could come up with this switchstatement

pref = userinput()

switch(pref){
case 0: print(meats)
case 1: print(seafoods)
case 2: print(salads)
}

hope you get the idea ^^