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

144 Chapter 4 Loops
4.4 Suppose the input is 2 3 4 5 0. What is the output of the following code?
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int number, max;
number = input.nextInt();
max = number;
while (number != 0) {
number = input.nextInt();
if (number > max)
max = number;
}
}
}
System.out.println("max is " + max);
System.out.println("number " + number);
4.5 What is the output of the following code? Explain the reason.
int x = 80000000;
while (x > 0)
x++;
System.out.println("x is " + x);
Key
Point
4.3 The do-while Loop
A do-while loop is the same as a while loop except that it executes the loop body
first and then checks the loop continuation condition.
The do-while loop is a variation of the while loop. Its syntax is:
do-while loop
do {
// Loop body;
Statement(s);
} while (loop-continuation-condition);
Its execution flowchart is shown in Figure 4.2.
The loop body is executed first, and then the loop-continuation-condition is evaluated.
If the evaluation is true, the loop body is executed again; if it is false, the do-while
loop terminates. The difference between a while loop and a do-while loop is the order in
which the loop-continuation-condition is evaluated and the loop body executed. You
can write a loop using either the while loop or the do-while loop. Sometimes one is a more
convenient choice than the other. For example, you can rewrite the while loop in Listing 4.5
using a do-while loop, as shown in Listing 4.6.
LISTING 4.6
TestDoWhile.java
1 import java.util.Scanner;
2
3 public class TestDoWhile {