Assignment #1 - Chapter 2 Exercises

From chapter 2, do programming exercises 2.1, 2.5, 2.6, and 2.7 (these start on page 79)
Filenames should be

• Prob2_1.java
• Prob2_5.java
• Prob2_6.java
• Prob2_7.java

To do these exercises, you will need the following MyInput class that was used in lecture. This class can read in strings, integers, and doubles from the keyboard. Paste this class into each of your own program files.

// a class for reading various types from the keyboard (System.in) 
class MyInput
{
    public static String readString()
    {
        String string = "";
        java.io.BufferedReader bufferedReader = 
           new java.io.BufferedReader(new java.io.InputStreamReader(System.in));
        try
        {
            string = bufferedReader.readLine();
        }
        catch (java.io.IOException ex)
        {
            throw new RuntimeException(ex);
        }
        return string;
    }

    public static int readInt()
    {
        return Integer.parseInt(readString());
    }

    public static double readDouble()
    {
        return Double.parseDouble(readString());
    }

    // test all the methods of this class
    public static void main(String[] args)
    {
        System.out.println("Testing 'readString()'");
        System.out.print("Input your string : ");
        System.out.println("Your string was '" + readString() + "'");
        System.out.println("\nTesting 'readInt()'");
        System.out.print("Input your int : ");
        System.out.println("Your int was '" + readInt() + "'");
        System.out.println("\nTesting 'readDouble()'");
        System.out.print("Input your double : ");
        System.out.println("Your double was '" + readDouble() + "'");
    }
}

Compiling

Example:

  javac Prob2_1.java
  java Prob2_1

Submitting: