Validating User Input
In this lab, you will make additions to a Java program provided with the data files for this book. The program is a guessing game. A random number between 1 and 10 is generated in the program. The user enters a number between 1 and 10, trying to guess the correct number. If the user guesses correctly, the program congratulates the user, and then the loop that controls guessing numbers exits; otherwise the program asks the user if he or she wants to guess again. If the user enters "V', he or she can guess again. If the user enters "N", the loop exits. You can see that the "V" or "N" is the sentinel value that controls the loop. Note that the entire program has been written for you. You need to add code that validates correct input, which is "Y" or "N" when the user is asked if he or she wants to guess a number, and a number in the range of 1 through 10 when the user is asked to guess a number.
1. Open the source code file named GuessNumber.java using Notepad or the text editor of your choice.
2. Write loops that validate input at all places in the code where the user is asked to provide input. Comments have been included in the code to help you identify where these loops should be written.
3. Save this source code file in a directory of your choice, and then make that directory your working directory.
4. Compile the source code file GuessNumber.java.
5. Execute the program. See if you can guess the randomly generated number. Execute the program several times to see if the random number changes. Also, test the program to verify that incorrect input is handled correctly. On your best attempt, how many guesses did you have to take to guess the correct number?
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