Programming Fundamentals I (Chapter 4 - Loops)

How many times will the following do-while loop be executed? int x = 11; do { x += 20; } while (x > 100);

1

What will be the value of x after the following code is executed? int x = 10; while (x < 100) { x += 10; }

100

What will be the value of x after the following code is executed? int x = 10, y = 20; while (y < 100) { x += y; y += 20; }

210

What will be the value of x after the following code is executed? int x, y = 15, z = 3; x = (y--) / (++z);

3

What will be the value of x after the following code is executed? int x = 10; for (int y = 5; y < 20; y +=5) x += y;

40

In all but rare cases, loops must contain within themselves

A way to terminate

Before entering a loop to compute a running total, the program should first do this

Set the accumulator where the total will be kept to an initial value, usually zero

A loop that executes as long as a particular condition exists is called a(n):

Conditional loop

In a for statement, the control variable can only be incremented

False

In the for loop, the control variable cannot be initialized to a constant value and tested against a constant value

False

The do-while loop is a pre-test loop

False

Which of the following will open a file named MyFile.txt and allow you to read data from it?

File file = new File("MyFile.txt"); Scanner inputFile = new Scanner(file);

Which of the following will open a file named MyFile.txt and allow you to append data to its existing contents?

FileWriter fwriter = new FileWriter("MyFile.txt", true); PrintWriter outFile = new PrintWriter(fwriter);

If a loop does not contain within itself a way to terminate, it is called a(n):

Infinite loop

This is a control structure that causes a statement or group of statements to repeat

Loop

This variable controls the number of times that the loop iterates

Loop control variable

What will be the value of x after the following code is executed? int x = 10, y = 20; while (y < 100) { x += y; }

This is an infinite loop

What will be the value of x after the following code is executed? int x = 10; while (x < 100); { x += 10; }

This is an infinite loop

Java provides a set of simple unary operators designed just for incrementing and decrementing variables

True

You can use the PrintWriter class to open a file for writing and write data to it

True

This type of loop is ideal in situations where you always want the loop to iterate at least once

do-while loop

This type of loop is ideal in situations where the exact number of iterations is known

for loop

When using the PrintWriter class, which of the following import statements would you write near the top of your program?

import java.io.*;

A sentinel value ________ and signals that there are no more values to be entered

is a special value that cannot be mistaken as a member of the list

What will be the values of x and y as a result of the following code? int x = 12, y = 5; x += y--;

x = 17, y = 4