import java.util.Random;

/**

* Example code related to histograms.

*/

public class Histogram {

/**

* Returns an array of random integers.

*/

public static int[] randomArray(int size) {

Random random = new Random();

int[] a = new int[size];

for (int i = 0; i < a.length; i++) {

a[i] = random.nextInt(100);

}

return a;

}

/**

* Computes the number of array elements in [low, high).

*/

public static int inRange(int[] a, int low, int high) {

int count = 0;

for (int i = 0; i < a.length; i++) {

if (a[i] >= low && a[i] < high) {

count++;

}

}

return count;

}

public static void main(String[] args) {

int numValues = 8;

int[] array = randomArray(numValues);

ArrayExamples.printArray(array);

int[] scores = randomArray(30);

int a = inRange(scores, 90, 100);

int b = inRange(scores, 80, 90);

int c = inRange(scores, 70, 80);

int d = inRange(scores, 60, 70);

int f = inRange(scores, 0, 60);

// making a histogram

int[] counts = new int[100];

for(int i = 0; i < counts.length; i++) {

count[i] = inRange(scores, i, i+1);

}

//more efficient loop that only traverses array once

for (int i = 0; i < scores.length; i++) {

int index = scores[i];

counts[index]++;

}

//foreach

//basic for loop

for(int i = 0; i < values.length; i++){

System.out.println(values[i]);

}

//written as for each

for(int value : values) {

System.out.println(value);

}

// histogram with enhanced for loop

counts = new int[100];

for (int score : scores) {

counts[score]++;

}

/* For the foreach loop above, write a method called histogram that

* takes an int array of scores from 0 to (but not including) 100, and

* returns a histogram of 100 counters. Generalize it to take the number

* counters as an argument.

*/

}

}