gistfile1.java

/**
 * Write a program to read a list of nonnegative integers 
 * and to display the largest integer, the smallest integer, 
 * and the average of all integers.  
 * The user indicates the end of the input by 
 * entering a negative sentinel value that is not used in 
 * finding the largest, smallest, and average values.  
 * The average value should be a value type double, 
 * so it can be computed with it's fractional part.
 * 
 * @Alex Frazer
 * @1.0
 */
import java.util.LinkedList;
import java.util.Scanner;
import java.util.ListIterator;

public class CS1_Frazer_X8_2
{
    public static void main(String[] args)
    {
        // I used a linked list and used the API library to find it out.
        LinkedList<Integer> num = new LinkedList<Integer>();
        int minimum = 0;
        int maximum = 0;
        int current;
        int total = 0;
        double average;
        
        System.out.println("Please enter numbers.  To end list and calculate, use a negative integer.");
        
        Scanner kbd = new Scanner(System.in);
        while(true)
        {
            int num_read = kbd.nextInt();
            if (num_read <0) break;
            num.add(num_read);
        }

        ListIterator itr = num.listIterator();

        while(itr.hasNext())
        {
            current = (Integer)itr.next();
            if (current < minimum) minimum = current;
            if (current > maximum) maximum = current;
            total += current;
        }

        average = total/num.size();
        System.out.println("The smallest number is " + minimum);
        System.out.println("The largest number is " + maximum);
        System.out.println("The average is " + average);
    }
}