if ( !(cost < 50) )
System.out.println("Reject these shoes");
else
System.out.println("Acceptable shoes");
(There are other ways to write this fragment. See below.)
It is important to put parentheses around the entire expression so the NOT is applied correctly. Say that you are considering a pair of $35 shoes. Evaluation proceeds like this:
! ( cost < 50 ) ! ( 35 < 50 ) -----+---- | ! ( T ) ------+-------- | F
The entire condition evaluates to false and so the false branch of
the if
statement is selected.
The program prints out "Acceptable shoes".
Is the following program fragment correct?
if ( !cost < 50 ) System.out.println("Reject these shoes"); else System.out.println("Acceptable shoes");