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At a club door the guard asks the age first.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
At a club door the guard asks the age first. A person of 18 or more is then asked for a ticket. Write the decision with a nested if, so that the result is one of three messages: Welcome in., You need a ticket. or You are too young. Then write the table of the four cases.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Plan. The ticket question belongs inside the age question.
The four cases.
| Age | Ticket? | Output |
|---|---|---|
| 20 | yes | Welcome in. |
| 20 | no | You need a ticket. |
| 15 | yes | You are too young. |
| 15 | no | You are too young. |
Check. The inner else lines up with the inner if, and the outer else lines up with the outer if. A young person never gets the ticket question.
Answer: The program above. The last two rows give the same message, because the age decides first.
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