Answer:
if ( fiber >= 4 || foam >= 3 )
System.out.println("House passes the code requirements!" );
else
System.out.println("House fails." );
Difference between AND and OR
Here is what would happen if a house had 6 inches of fiberglass batting and 0 inches of plastic foam:
fiber >= 4 || foam >= 3
--------- ---------
true false
---------------
true
One true is enough.
AND is different from OR. Both of them combine Boolean values ( true/false values ) into one Boolean value. But each does this in a different way:
- All the values AND combines must be true to get a true.
- At least one of the values OR combines must be true to get a true.
The operation of AND and OR can be displayed in a truth table.
In the table, A and B are operands. They stand for true/false values or
expressions that yield true/false values.
For example, A could stand for a relational expression such
as memory > 512phrase.equals( "quit" )
| A | B | A && B | A || B |
|---|---|---|---|
| F | F | F | F |
| F | T | F | T |
| T | F | F | T |
| T | T | T | T |
Each row of the truth table shows how logical operators combine the true/false values of operands. For example, row one says that if A is false and B is false, then A && B is false also A || B is false.
Row three says that if A is true and B is false, then A && B is false also A || B is true.
All possible truth values of the operands A and B are listed in the left two columns. Each operand can take the value true or the value false, so there are four possible combinations of values for the two operands.
QUESTION 21: