FilesExpand file tree

 master

/

Histogram.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

59 lines (51 loc) · 1.45 KB

 master

/

Histogram.java

Copy path

Top

File metadata and controls

• Code
• Blame

59 lines (51 loc) · 1.45 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

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 < scores.length; i++) {

int index = scores[i];

counts[index]++;

}

// histogram with enhanced for loop

counts = new int[100];

for (int score : scores) {

counts[score]++;

}

}

}