Exam 5: Loops and Files

When the break 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.

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

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);

This is an item that separates other items.

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

In all but rare cases, loops must contain within themselves

Given the following statement, which statement will write the string "Calvin" to the file DiskFile.txt? PrintWriter diskOut = new PrintWriter("DiskFile.txt");

The for loop is a posttest loop that has built-in expressions for initializing, testing, and updating.

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; }

This type of loop will always be executed at least once.

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

You can use this method to determine whether a file exists.

A loop that repeats a specific number of times is known as a(n) ________ loop.

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

The while loop is ideal in situations where the exact number of iterations is known.

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

The variable used to keep the running total is called a(n)

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

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 from the list to be processed.

A for loop normally performs which of these steps?