Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

112 Chapter 3 Selections
The result of this conditional expression is expression1 if boolean-expression is true;
otherwise the result is expression2.
Suppose you want to assign the larger number of variable num1 and num2 to max. You can
simply write a statement using the conditional expression:
max = (num1 > num2) ? num1 : num2;
For another example, the following statement displays the message “num is even” if num is
even, and otherwise displays “num is odd.”
System.out.println((num % 2 == 0) ? "num is even" : "num is odd");
As you can see from these examples, conditional expressions enable you to write short and
concise code.
Note
The symbols ? and : appear together in a conditional expression. They form a conditional
operator called a ternary operator because it uses three operands. It is the only
ternary operator in Java.
✓Point✓ Check
3.33 Suppose that, when you run the following program, you enter input 2 3 6 from the
console. What is the output?
public class Test {
public static void main(String[] args) {
java.util.Scanner input = new java.util.Scanner(System.in);
double x = input.nextDouble();
double y = input.nextDouble();
double z = input.nextDouble();
}
}
System.out.println((x < y && y < z) ? "sorted" : "not sorted");
3.34 Rewrite the following if statements using the conditional operator.
if (ages >= 16)
ticketPrice = 20;
else
ticketPrice = 10;
if (count % 10 == 0)
System.out.print(count + "\n");
else
System.out.print(count);
3.35 Rewrite the following conditional expressions using if-else statements.
a. score = (x > 10) ? 3 * scale : 4 * scale;
b. tax = (income > 10000) ? income * 0.2 : income * 0.17 + 1000;
c. System.out.println((number % 3 == 0) ? i : j);
Key
Point
3.16 Formatting Console Output
You can use the System.out.printf method to display formatted output on the console.
Often it is desirable to display numbers in a certain format. For example, the following code
computes interest, given the amount and the annual interest rate.
double amount = 12618.98;
double interestRate = 0.0013;