Answer:
| 5 > 2 || 12 <= 7 | T |
| 5 > 2 && 12 <= 7 | F |
| 3 == 8 || 6 != 6 | F |
| 3 == 8 && 6 != 6 | F |
NOT!
The NOT operator in Java is this: !
(exclaimation point).
The NOT operator changes true to false
and false to true,
as seen in the truth table.
This may seem like a silly thing to do,
but often it is useful.
Sometimes it is more natural to express
a condition in a particular way, but the program logic
calls for the reverse of what you have written.
Time for the NOT operator.
| A | !A |
|---|---|
| true | false |
| false | true |
Say that you are shopping for new shoes. You are only interested in shoes that cost less than $50. Here is a program fragment:
if ( ______(cost < 50) )
System.out.println("Reject these shoes");
else
System.out.println("Acceptable shoes");
QUESTION 22:
Fill in the blank so that the program fragment rejects shoes that do not cost less than $50.