This chapter introduces relational and logical operators. It also discusses the use of these operators to write Boolean expressions.
17. Car Purchase Decision
Answer:
No
Car Purchase Decision
Car Purchase Decision
You need money OR credit. Just one would be enough. Of course, if you had lots of money and plenty of credit you could certainly buy the car.
Sometimes a program has to test if one or the other (or both) of the conditions has been met. Here is how that is done with the car purchase problem.
How much cash do you have? How much credit do you have? if ( cash>=25000 || credit>=25000 ) System.out.println("Enough to buy this car!"); else System.out.println("Have you considered a Yugo?"); |
The symbol || (vertical-bar vertical-bar) means OR. On your keyboard, vertical-bar is the top character on the key above the "enter" key. The OR operator evaluates to true when either qualification
is met or when both are met. The if
statement asks a question with two parts:
if ( cash >= 25000 || credit >= 25000 )
------------- -------------
cash part credit part
If either part is true, or both parts are true, then the entire boolean expression is true.
Question 17:
Say that you enter 56000 for cash
and 0 for credit
. What answer (true or false) does each part give you?