Arrays

[swim_fan08]

Can someone please, help me correct my errors and get my while structure working?

Errors I get:

java:28: while expected do System.out.println ("Enter a number between 0 and 15. (Press 16 to quit the program)");

java:30: ')' expected num = scan.nextLine();

import java.util.Scanner;

public class Occurrences
{
   public static void main (String[] args)
   {
	   Scanner num = new Scanner(System.in);

	   //-----------------------------------------
	   //Reads an arbitrary number of integers that
	   //are in the range of 0 to 15 inclusive.
	   //Counts how many occurrences of each are
	   //entered.
	   //----------------------------------------

      int[] array = new int[15];
      int index, num, next;

		while (num >= 0 || num <= 15)
		numbers[index] = next;
		{
		do System.out.println ("Enter a number between 0 and 15. (Press 16 to quit the program)");
		num = scan.nextLine();
		}


      //---------------------------------------------------
	  //display a histogram that shows the number of times
	  //a number was entered in each of the following ranges:
	  //0 - 5, 6 - 10, and 11 - 15. Show one asterisk for each
	  //occurence entered.
	  //----------------------------------------------------
	  String[] asterisk={"0- 5: ","6- 10: ","11- 15:"};
      for (index=0;index<num;index++)
      {
		  next=numbers[index];

					if (next<5) asterisk[0] +="*";
					else if (next<6) asterisk[1] +="*";
					else if (next<15) asterisk[2] +="*";

			}

			for (index=0;index<3;index++)
 				System.out.println(asterisk[index]);
   }

}

[angryboy]

do System.out.println...
what is do? do what? that's the error.

[Fubarable]

I would just scrape your while loop and re-write it. You've got it completely ferschmuttered. For info on how to do while loops, please look here: The while and do-while Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)

Best of luck.

[Eranga]

do System.out.println...
what is do? do what? that's the error.

Yep, please copy-paste your error message to see here. No one don't know what the error is.

[swim_fan08]

import java.util.Scanner;

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

	   //-----------------------------------------
	   //Reads an arbitrary number of integers that
	   //are in the range of 0 to 15 inclusive.
	   //Counts how many occurrences of each are
	   //entered.
	   //----------------------------------------


	  final int LIMIT = 15;

      int[] array = new int[LIMIT];
      int num, next, index;

		while (num < 0 || num > 15)
		{

		System.out.println ("Enter a number between 0 and 15. (Press 16 to quit the program)");
		num = scan.nextLine();

		while (num !=16)
		{

		System.out.println ("Enter a number between 0 and 15. (Press 16 to quit the program)");
		num = scan.nextLine();
		}
	}


      //---------------------------------------------------
	  //display a histogram that shows the number of times
	  //a number was entered in each of the following ranges:
	  //0 - 5, 6 - 10, and 11 - 15. Show one asterisk for each
	  //occurence entered.
	  //----------------------------------------------------
	  String[] asterisk={"0- 5: ","6- 10: ","11- 15:"};
      for (index=0;index<num;index++)
      {
		  next=array[index];

					if (next<5) asterisk[0] +="*";
					else if (next<6) asterisk[1] +="*";
					else if (next<15) asterisk[2] +="*";

			}

			for (index=0;index<array.size;index++)
 				System.out.println(asterisk[index]);
   }

}

I just edited and got fewer errors:

java:32: incompatible types
found : java.lang.String
required: int
num = scan.nextLine();

java:38: incompatible types
found : java.lang.String
required: int
num = scan.nextLine();

java:60: cannot find symbol
symbol : variable size
location: class int[]
for (index=0;index<array.size;index++)

My program is suppose to ask a user for a number between 0-15 inclusive, not allow the user to enter invalid data, when the user enters invalid data its suppose to display a histogram of the occurrences of the numbers entered and its suppose to use a while structure. And since I am using Scanner as the name of the class it should not be used as a variable that is receiving a value from the input stream. Thats why I am using

int num;
   num = scan.nextLine()

Which is were some of my errors are coming from. :(

[angryboy]

You want to take a look at the Scanner API.
-- Scanner.nextLine:String
-- Scanner.nextInt:int

You want to get an int, so you should use nextInt instead.

[Eranga]

Scanner (Java Platform SE 6)

[CJSLMAN]

Your "while" conditions are not correct:

while (num [B][COLOR="Red"]<[/COLOR][/B] 0 || num [B][COLOR="red"]>[/COLOR][/B] 15)

The above indicates that it should loop while num is less than zero and greater than 15: I think you want the following:

while (num [B][COLOR="Blue"]>=[/COLOR][/B] 0 || num [B][COLOR="blue"]<=[/COLOR][/B] 15)

Now, the above code indicates that the "while" loop will work while num is greater or equal than zero or less or equal to 15.

Luck,
CJSL