Nested While Statements

Question

Hey guys,
Im fairly new to Java programing and i have hit a brick wall in my coding.
My program is a Multi-choice questionaire. And all works fine until i add the error checking code in, and i dont get (and I can't get to work) nested will statements.
Could you guys help me merge these to Statements:
while(!in.hasNextInt())       //This part works fine
{                                             //This is to check if the user put in a interger.
in.nextLine();
System.out.println("\n Invalid Selection!");   
System.out.println("Please Enter Amswer \n" );
}and this part i cant get this part to work correctly
if (Userinput >5 || Userinput <0)    //This is ment to set parameters so that
{                                                            //the user can only enter the numbers
in.nextLine();                                      //between 1 - 5
System.out.println("\n Invaild Selcetion");
System.out.println("Please Enter Answer\n" );
Userinput = in.nextInt();
}I would like to have both sections of code as 1 section so that it checks for both errors before it continues throught he rest of the code.
any help would be greatly appreciated.
if you want to email me or get me on msn:
brokenstaff at gmail dot com
again thanks.

Answer 1

ok, well that is a very complex section =)
well i tried it, but that numer validator still wont allow numbers under 5 ??? i dont know why. It works in the way of giving the error message when entering a char.
any way here is the full code with code inserted:
PS the counter intilization well that is for later.
and you can proably already figure out why it is there. =)
import java.util.*;
public class questions
  public static void main(String[] args)
    int correct = 0; //Couter for correct answers.
    int incorrect = 0; //Couter for incorrect answers.
    int Userinput = 0; //Number entered by user.
    int userInput = -1;  // I am just guessing these go here =)
    boolean done = false;
    boolean first = true;
    Scanner in = new Scanner(System.in);       
    // QUESTION ONE
    System.out.println ("Question 1:");
    System.out.println ("");
    System.out.println ("Which Java statement displays Hello World to the screen");
    System.out.println ("and then moves cursor to a new line?");
    System.out.println ("");
    System.out.println ("\t 1. Print \"Hello World\" n");
    System.out.println ("\t 2. System.out.print(\"Hello World\" + nl);");
    System.out.println ("\t 3. System.out.println(\"Hello World\");");
    System.out.println ("\t 4. System.out.println(\"Hello World\" + newline);");
    System.out.println ("\t 5. None of the above");
    System.out.println ("");
    System.out.println ("Enter Answer");
/*// THIS SECTION ERROR CHECKS CHARACTERS
    // AND WORKS
    while(!in.hasNextInt())  
      in.nextLine();
       System.out.println("\n Invalid Selection!");   
       System.out.println("Please Enter Amswer \n" );
// DOSENT WORK 
//    while ((!in.hasNextInt) && (Userinput >100 || Userinput <0))
//      in.nextLine();   
//       System.out.println("\n Invalid Selection!");   
//       System.out.println("Please Enter Amswer \n" );
    while(!done) {
        if(!first) {
            in.nextLine();
            System.out.println("\nInvalid selection!");
        } else first = false;
        System.out.println("Please enter answer\n" );
        if(!in.hasNextInt()) {
            continue;
        userInput = in.nextInt();
        done = userInput >= 0 && userInput <= 5;
    System.out.println("userInput=" + userInput);
//THIS PART KEEP
    userInput = in.nextInt();   
    if (Userinput == 1 )
    System.out.println ("You are correct! - Well done");
    else
    System.out.println ("Sorry wrong answer - Better luck next time"); 
    // QUESTION TWO
    System.out.println ("Question 2:");
    System.out.println ("");
    System.out.println ("Which Java statement correctly initializes");
    System.out.println ("a varible at the beggining of a program?");
    System.out.println ("");
    System.out.println ("\t 1. int Userinput = 0;");
    System.out.println ("\t 2. Userinput ; 0 = int");
    System.out.println ("\t 3. Userinput int = 0;");
    System.out.println ("\t 4. int 0 = Userinput;");
    System.out.println ("\t 5. None of the above");
    System.out.println ("");
    System.out.println ("Enter Answer");
    if (Userinput == 1)
     System.out.println ("You are correct! - Well done");
    else
     System.out.println ("Sorry wrong answer - Better luck next time");
    // QUESTION THREE
    System.out.println ("Question 3:");
    System.out.println ("");
    System.out.println ("Which Java statement ius the first line");
    System.out.println ("inside the public class brackets?");
    System.out.println ("");
    System.out.println ("\t 1. (String[public static void main]) args ");
    System.out.println ("\t 2. static void public(main[String]) args");
    System.out.println ("\t 3. [String]args main() void public");
    System.out.println ("\t 4. public static void main(String[] args)");
    System.out.println ("\t 5. None of the above");
    System.out.println ("");
    System.out.println ("Enter Answer");
    if (Userinput == 4)
     System.out.println ("You are correct! - Well done");
    else
     System.out.println ("Sorry wrong answer - Better luck next time");
    // QUESTION FOUR
    System.out.println ("Question 4:");
    System.out.println ("");
    System.out.println ("Which Java boolean operator is the correct ");
    System.out.println ("operatorfor NOT?");
    System.out.println ("");
    System.out.println ("\t 1. NOT");
    System.out.println ("\t 2. NONE");
    System.out.println ("\t 3. ==");
    System.out.println ("\t 4. !");
    System.out.println ("\t 5. None of the above");
    System.out.println ("");
    System.out.println ("Enter Answer");
    if (Userinput == 4)
     System.out.println ("You are correct! - Well done");
    else
     System.out.println ("Sorry wrong answer - Better luck next time");
     // QUESTION FIVE
    System.out.println ("Question 5:");
    System.out.println ("");
    System.out.println ("Which Java statement displays Hello World to the screen");
    System.out.println ("and then moves cursor to a new line?");
    System.out.println ("");
    System.out.println ("\t 1. Print Hello World n");
    System.out.println ("\t 2. System.out.print(Hello World + nl);");
    System.out.println ("\t 3. System.out.println(Hello World);");
    System.out.println ("\t 4. System.out.println(Hello World + newline);");
    System.out.println ("\t 5. None of the above");
    System.out.println ("");
    System.out.println ("Enter Answer");
    if (Userinput == 3)
     System.out.println ("You are correct! - Well done");
    else
     System.out.println ("Sorry wrong answer - Better luck next time");
    // END CODE
    System.out.println ("\n");
    System.out.println ("PP400 MUTIPLE CHOICE QUIZ");
    System.out.println ("=========================");
    System.out.println ("");
    System.out.println ( + incorrect + " WRONG");
    System.out.println ( + correct + " CORRECT");
    System.out.println ("");
    System.out.println ("End Of Quiz");
}I commented out all the other questions so when I test the app i dont have to cycle through all the questions. Just thought it was a short cut way of doing it.