Exam 5: Loops and Files

The while loop is always the best choice in situations where the exact number of iterations is known.

When you open a file with the PrintWriter class, the class can potentially throw an IOException.

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

In general, there are two types of files which are

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

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

Which of the following statements opens a file named MyFile.txt and allows you to append data to its existing contents?

In all but very rare cases, loops must contain, within themselves

Assume that inputFile references a Scanner object that was used to open a file. Which of the following while loops is the correct way to read data from the file until the end of the file is reached?

A file must always be opened before using it and closed when the program is finished using it.

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; }

A(n) __________ is a special value that cannot be mistaken as a member of a list of data items and signals that there are no more data items to be processed.

What will be the value of x after the following code is executed? int x, y = 15; X = y--;

When you pass the name of a file to the PrintWriter constructor and the file already exists, it will be erased and a new empty file with the same name will be created.

What does the following code do? Scanner keyboard = new Scanner(System.in); String filename; System.out.print("Enter the filename: "); Filename = keyboard.readString(); PrintWriter outFile = new PrintWriter(filename);

Which of the following is the method you can use to determine whether a file exists?

A __________ is a value that signals when the end of a list of values has been reached.

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

The __________ loop is ideal in situations where you always want the loop to iterate at least once.

Select all that apply. Which of the following steps is normally performed by a for loop?