arrayMath

import java.util.Arrays;

public class MartinHaileyHW07 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		final int TOTAL_RESPONSES = 9;
		final int RATING_MIN = 0;
		final int RATING_MAX = 5;
		int[] results  = new int[TOTAL_RESPONSES];
		double arrayMean = 0;
		double arrayMedian = 0;

		System.out.println(TOTAL_RESPONSES +" people took the survey\r\n"
				+ "The ratings were from 0 to 5\r\n");
		
		fillArray(results, RATING_MIN, RATING_MAX);
		
		System.out.println("******* Survey Results **********");
		displayArray(results);
		
		arrayMean = calculateMean(results);
		System.out.printf("\nThe survey average is %.1f \n", arrayMean);
		
		int[] sortedResults = new int[TOTAL_RESPONSES];
		//copy results array to sorted array
		for (int i = 0; i < results.length; i++) {
			sortedResults[i] = results[i];
		}
		
		sortedResults = createSortedArray(results);
		
		System.out.println("\n******* Sorted Survey Results **********");
		displayArray(sortedResults);
		
		arrayMedian = calculateMedian(sortedResults);
		System.out.printf("\nThe survey median is %.1f\n", arrayMedian);
		
		
		int[] frequency = new int[results.length];
		
		
		fillFrequencyArray(sortedResults, frequency);
	
		displayFrequency(frequency, RATING_MIN, RATING_MAX);
		
		
		
		
	}//end of main
	
	
	
	//Fill an array with random survey results.

	public static void fillArray(int numbers[], int min, int max) {
		for (int i = 0; i < numbers.length; i++) {
			numbers[i] += (int)(Math.random()*(max-min + 1)+ min);
			//System.out.println(number[i]);
		}
		
		

	}
	
	//display array
	
	public static void displayArray(int numbers[]) {
		
		for (int i = 0; i < numbers.length; i++) {
			
			System.out.printf("results[%d] = %d \n",i, numbers[i]);
		}
	}
	
	
	
	
	//mean  
	
	
	public static double calculateMean(int numbers[]) {
		double mean = 0;
		double sum = 0;
		for (int i = 0; i < numbers.length; i++) {
			sum = sum + numbers[i];
			
		}
		mean = sum / numbers.length;
		return mean;
	}
	
	
	//sort array
	
	public static int[] createSortedArray (int [] numbers) {
		int [] sortedArray = new int [numbers.length];
		
		for (int i = 0; i < numbers.length; i++) {
			sortedArray[i] = numbers[i];			
		}
		for (int i=0 ; i < numbers.length; i++) {
			Arrays.sort(sortedArray);
		}
	return sortedArray;
	}
	
	//median
	
	public static double calculateMedian(int numbers[]) {
		double median = 0;
			if(numbers.length %2 == 0) {
				median = ((numbers[(numbers.length-1)/2]) + (numbers[(numbers.length-1)/2]))/2;
				//median = median /2;
				
			}else {
				median = numbers[(numbers.length-1)/2];
			}
		
		return median;
		
	}
	
	
	//frequency
	
	public static void fillFrequencyArray(int numbers[], int freq[]) {
		int visited = -1;
		
		for(int i = 0; i <numbers.length; i++) {
			int count = 1;
			for(int j = i+1; j < numbers.length; j++) {
				if(numbers[i] == numbers[j]) {
					count++;
					
					//this avoids counting the same thing again
					freq[j] = visited;
				}
			}
			if(freq[i] != visited) {
				freq[i] = count;
			}
		}
		
		
		
		//display
		for(int i=0; i < freq.length; i++) {
			if(freq[i] != visited) {
				System.out.println("Frequency of " +numbers[i]+ " : " +freq[i]);
			}
		}
		System.out.println("\n");
	}
	
	public static void displayFrequency(int freq[], int min, int max) {
			
		
		for(int i=min; i < freq.length; i++) {
			
			if(freq[i] != -1) {
				
				System.out.println("Frequency of " + min + " : " +freq[i]);
				min++;
				
			}
		}
			
		
		
	
	
	}
	
	
	}//end of class