Exam 4: Loops and Files

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

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; }

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

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

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 loop that executes as long as a particular condition exists is called a(n) __________ loop.

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

When the continue statement is encountered in a loop, all the statements in the body of the loop that appear after it are ignored, and the loop prepares for the next iteration.

When working with the PrintWriter class, which of the following import statements should you have near the top of your program?

The __________ loop allows the user to decide on the number of iterations.

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

In the following code, what values could be read into number to terminate the while loop? Scanner keyboard = new Scanner(System.in); System.out.print("Enter a number: "); Int number = keyboard.nextInt(); While (number < 100 || number > 500) { System.out.print("Enter another number: "); Number = keyboard.nextInt(); }

The while loop has two important parts: (1) a boolean expression that is tested for a true or false value, and (2) a statement or block of statements that is repeated as long as the expression is true.

A __________ loop will always be executed at least once.