Thread: Arrays

Modify the stats class created in the previous assignment to allow it to store and analyze data sets of different sizes. it should now have an array that holds 100 double values instead of 12. An instance variable numElt will keep track of how many elements in the atrray are being used by a particular instance of the class. All of the Stats class functions should be revised to work with numElt elements instead of 12.

Can someone please guide me as to what exactly i need to do. im kinda confused.

public class Stats 
{   
    // records array field created to store twelve values
    private double [] records = new double [12];
 
    // method to set values in array
    public void setValue(int rainfall, double actValue )
    {
        records[rainfall] = actValue;
    }
 
    public void processRainfallStats()
    {
        System.out.printf("The total rainfall for the year is %.2f\n\n", getTotal());
 
        System.out.printf("The average rainfall for the year is %.2f\n\n", getAverage());
 
        System.out.printf("The least rainfall for the year is %.2f\n\n", getSmallest());
 
        System.out.printf("The most rainfall for the year is %.2f\n\n", getLargest());
    }       
 
    // method to calculate total
     public double getTotal()
    {   
        double total = 0;
 
        for (double tot : records)
        {total += tot;}
        return total;
    }
 
     // method to calculate average rainfall in records array
    public double getAverage()
    {
        double average;
 
        int total = 0;
 
        for (double avg: records)
        {total += avg;}
        average = total / records.length;
 
        return average;
    }
 
    // method to find largest index value in records array
    public double getLargest()
    {
        double largest = records[0]; // assuming that records[0] is the largest
 
        for (double Lag : records)
        {
            if (Lag > largest)
            {largest = Lag;}
        }
        return largest;
    }
 
    // method to find smallest index value in records array
    public double getSmallest()
    {
        double smallest = records[0]; // assuming that records[0] is the smallest
 
        for (double small: records)
        { if (small < smallest)
            {smallest = small;}
        }
        return smallest;
    }
 
 
}

package leedanielassignment4;
 
import java.util.Scanner;
 
public class StatsTest 
{
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
 
        // new object of Stats class created
        Stats myStats = new Stats();
 
        int rainfall;
        double actValue;
 
        // new array of months to be store months
        String [] months = new String[] {"January","February","March","April","May","June","July","August",
                                            "September","October","November","December"};
 
        for (int i = 0; i < months.length; i++)
        {
            // print method used to set value to month 
            System.out.printf("Please eneter the amount of rainfall for %s:\n ", months[i]);
 
            rainfall = i;
            actValue = input.nextDouble();
 
                if(actValue < 0)
                    {actValue = 0;}
            // object calling method in class to initiate values
            myStats.setValue(rainfall, actValue);
        }    
     // object calls method of stats class to print info   
     myStats.processRainfallStats();
    }

im wondering if i hav to make numelt as a copy of the array and then assign it to all records functions? or do something completely different from what im suggesting i do

sorry but i still doont get it

using a loop

i be tryna figure this thing out trying all kinds of things but still aint gettin it.. but thanks

aight thanks norm!! i was kinda close to this idea

--- Update ---

keeping track means just putting a limit on how much elements the array will use?

--- Update ---

is that what yu are saying is what im tryna do, will both of em giv me the result i want?

double [] Stats = new double [12]; // this is an array of 12 elements
int numElt = 10;
 
double [] Stats = {6, 2, 3, 56, 5, 67,  7, 23, 0, 0, 0, 0}; // this is a array of 12 elements, only 8 elements have values higher than 0
int numElt = 8;

Thanks.. very helpful.. solved. i was reading wrong!!