// Report on animal birth weights as entered by user
// Do not change your growth program to use this reading approach
// Beth Katz - April 2009

import java.text.DecimalFormat;
import java.util.Scanner;

public class BirthWeight2 {
	public static final int MaxInput = 20;
	public static final DecimalFormat fmt = new DecimalFormat("0.0");

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

		System.out.println("Enter up to " + MaxInput + " real values.");
		double[ ] weights = read(input);
		print(weights);
		System.out.println("5 occurs " + countOccurances(weights, 5) + " times");
	}
	
	// read many values from a Scanner and copy them into an array
	// just big enough to hold them
	// returns array holding up to MaxInput values
	// see p. 393 of text
	public static double[ ] read(Scanner in) {
		int count = 0;
		double[ ] original = new double[MaxInput];
		
		while (count < MaxInput && in.hasNextDouble( )) {
			original[count] = in.nextDouble( );
			count++;
		}
		
		return rightSizeArray(original, count);
	}
	
	// print array all on one per line with indexes
	public static void print(double[ ] a) {
		for (int i = 0; i < a.length; i++) {
			System.out.print("[" + i + "] " + fmt.format(a[i]) + " ");
		}
		System.out.println( );
	}

	// copy as many values as were read into right-sized array
	public static double[ ] rightSizeArray(double[ ] original, int count) {
		double[ ] copy = new double[count];		
		for (int i = 0; i < count; i++) {
			copy[i] = original[i];
		}
		return copy;
	}

	// returns how many times target value appears in array
	public static int countOccurances(double[ ] a, double target) {
		int count = 0;
		for (int i = 0; i < a.length; i++) {
			if ( a[i] == target) {
				count++;
			}
		}
		return count;
	}
}