This is all my code. I am having problems with the standard deviation formula. I run the program with these values:
Number of items: 5
Items: 16 25 81 80 24
I'm supposed to get this output:
Average: 45.20
Std Dev: 32.41
Less than Avg: 3
Array is not in sorted order
Instead, I get this output:
Array is not in sorted order
Average: 45.20
Std Dev: 55.60
Less than Avg: 3
import java.text.DecimalFormat;
import java.util.Scanner;
public class array {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
DecimalFormat df = new DecimalFormat ("#.00");
System.out.println("How many values do you want?");
int num = input.nextInt();
if (num< 1 || num > 100)
{
System.out.println("Error");
System.exit(0);
}
int[] array= valueArray(input, num);
double o= average(num, array);
double standdev = getStdDev(array, num);
int lessThanAvg = lessAvg ( array, num, o );
boolean sorted=isArraySorted(array, num);
System.out.println("Average: " + df.format(o));
System.out.println("Std Dev: " + df.format(standdev));
System.out.println("Less than Avg: " + lessThanAvg);
}
public static int[] valueArray (Scanner input, int num )
{
int[] values = new int[100];
System.out.println("What numbers do you want to put in?");
for (int j = 0; j < num; j++)
{
values[j]=input.nextInt();
}
return values;
}
public static double average ( int num ,int[] values)
{
double avg=0.0;
for (int i = 0; i < num; i++)
{
avg = avg+values[i];
}
return avg/num;
}
public static double getStdDev (int [] values, int num)
{
double avg = 0.0;
double sum = 0 ;
for (int i = 0; i < num - 1; i++)
{
sum = Math.sqrt ((Math.pow((values[i]-avg),2) + Math.pow((values[num-1]),2)) / num-1);
}
return sum;
}
public static int lessAvg ( int [] values, int num, double avg )
{
int counter = 0;
for (int i = 0; i < num; i++ )
{
if (values[i] < avg)
{
counter = counter + 1;
}
}
return counter;
}
public static boolean isArraySorted (int [] values, int num)
{
for (int i = 0; i < num - 2; i++)
{
if (values[i]>values[i+1])
{
System.out.println("Array is not in sorted order");
return false;
}
}
System.out.println("Array is in sorted order");
return true;
}
}
