Question

Using JAVA, write an application that uses an Array of 30 Numbers (random integers from 1 - 100) and returns the maximum number, minimum number, average of all numbers, and prints a Bar Chart to show the number distribution (1-9, 10-19,20-29, …80-89, 90-100). Note; maximum number, minimum number, average number, and the Bar Chart must use implemented as separate methods in a separate class. Method call should pass an array as an argument. Methods should accept an array as an input parameter, but return a number (double or integer). The bar chart will be in asterisk form. Sample output:

Maximum number: 96

Minimum number: 3

Average: 54

Bar Chart:

1-9: ****

10-19: ******

etc.

Also include the UML activity and class diagrams.

Answer 1

import java.util.Random;

class ArrayOperations{
// for maximum
public static int maximum(int a[])
{
int max = a[0];
for(int i=1; i<a.length;i++)
{
if(max < a[i])
max = a[i];
}
return max;
}
  
// for minimum
public static int minimum(int a[])
{
int min = a[0];
for(int i=1; i<a.length;i++)
{
if(min > a[i])
min = a[i];
}
return min;
}
  
// for bar chart
public static void barChart(int a[])
{
System.out.println("\nBar Chart:");
  
// storing frequency first
int[] freq = new int[10];
for(int i=0; i<a.length;i++)
{
if(a[i] == 100)
freq[9]++;
else
freq[a[i]/10]++;
}
  
// using that frequency printing chart
int x = 1, y = 9;
for(int i=0; i<freq.length;i++)
{
if(i==9)
y = 100;
System.out.printf("%2d-%3d : ",x,y);
for(int j=0; j<freq[i]; j++)
{
System.out.print("*");
}
x = x + 10;
y = y + 10;
  
if(i==9)
y = 100;
System.out.println();
}
}
  
}
class Main {
public static void main(String[] args) {
  
int[] a = new int[100];
Random r = new Random();
  
for(int i=0; i<100; i++)
{
a[i] = r.nextInt(100) + 1;
}
  
System.out.println("Maximum number: "+ArrayOperations.maximum(a));
System.out.println("Minimum number: "+ArrayOperations.minimum(a));
ArrayOperations.barChart(a);
}
}

Maximum number: 1060 Minimum number: 3 Bar Chart: 1- 9 21- 29 31- 39 81- 89 91-100: