creation: 7/30/99; small fix: 9/25/09; several questions changed: 2/27/2010; changed to button clicks 2/5/2025

Fill in the Blanks Chapter 12

Instructions:   This is a fill-in-the-blank exercise. Each question consists of a sentence with one or two words left out. For each question, think of the word or phrase that should fill each blank, then click on the blanks to see if you are correct.

This exercise reviews simple Java input and output. Much of this is detailed and hard to remember, so don't expect to get every question correct.

1.   When a program does INPUT, data flows the program.

2.   The Java package that contains Scanner is:

3.   Data flows into a program from an input of characters and is written to an

4.   The standard input stream is .

5.   Examine the following program, which reads in a line of text and then writes it to the monitor. Fill in blanks.

import ;
public class Echo
{
  public static void main (String[] args) 
  {
    Scanner scan =  new  ( System.in );   

    String inData;

    System.out.println("Enter the data:");
    inData = scan. ;

    System.out.println("You entered:" + inData );
  }
}

6.   An is an object that contains information about what went wrong in an operation.

7.   When a program sends an Exception to a higher level of the system, it the Exception.

8.   To input numeric data, first character data is input, then the characters are into a primitive numeric type.

9.   Examine the following program, which reads in a number and writes its square to the monitor. Fill in blanks.

 java.util.* ;  
public class EchoSquare
{  
  public static void main (String[] args)
  {
    Scanner scan = new Scanner ();  
    int num, square;                      // declaration of two int variables
    System.out.println("Enter an integer:");        
    num    = scan.();  
    square = num * num ;                     // compute the square
    System.out.println("The square of " + num + " is " + square );  
  }
}

10.   If the characters "one hundred forty two" were entered as data for the above program, it would throw an .

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