Question

Im working on modifying my current code to function with these changes below

Create a Java program that meets the following criteria

• You program should contain a “static method” double[] readArray(String filename) which accepts the name of a file to read as a String parameter.
  • This function should read all the values into a new array of “doubles”
    • NOTE: The first value of the file is an integer used to indicate the size of the array that you will need (see above)
  • The function should return the array which was created and read in this method.
    
• You program should contain a function double[] processArray() (double[] dataArray) which accepts the array read by the previous function.
  • This function should scan the array and calculate the following information:
    • The smallest value in the array.
    • The largest value in the array.
    • The average value in the array.
    • The sum of the values in the array.
    • A count of the number of items that are greater than the average value
    • The largest difference between any two adjacent values!
      1. For example, using the above sample input, the largest adjacent difference is between the values 7.876 and 3.1415 (array indexes 2 and 3), which is a difference of 4.7345.
      2. (This one is not terribly difficult, but it will require some thought!)
         
  • The function should return a new array of six values containing the information outlined above in the order shown.
    • For example, using the sample data file above, the array would contain the following values in the following order:
      { 1.23, 7.876, 3.9817, 19.9085, 2.0, 4.7345 }
      
    • The order is just: smallest, largest, average, sum, above average count, largest difference
      
• The main method should:
  • Check to see the user passed a filename to main itself via the (String[] args)
    • If no file name exists, the program should prompt the user to enter a source-file name.
      
  • Call the functions above to read the array and calculate the results.
    
  • Display all the final results for example:
    
    Smallest = 1.23
    Largest = 7.876
    Average = 3.9817
    Sum = 19.9085
    Count of Larger than Average = 2.0
    Largest Difference = 4.7345

My current code is show as below, i was wondering how i would go about doing that im a little lost.

import java.io.File;
import java.util.Scanner;

public class Lab5 {

    public static void main(String[] args) {
        String inFileName;

        if (args.length > 1) {
            inFileName = args[0];
        } else {
            Scanner console = new Scanner(System.in);
            System.out.println("Enter a Filename: ");
            inFileName = console.nextLine();
        }

        double[] myData = readArray(inFileName);
        double[] results = processArray(myData);

        // TODO: Display Results...
    }

    static double[] readArray(String filename) {
        File inFile = new File(filename);

        if (inFile.canRead()) {
            try {
                Scanner fileScanner = new Scanner(inFile);
                int count = fileScanner.nextInt();
                double[] data = new double[count];

                for (int i = 0; i < count; i++) {
                    data[i] = fileScanner.nextDouble();
                }

                return data;
            } catch (Exception e) {
                return new double[0];
            }
        } else {
            System.out.println("Can't read file.");
            return new double[0];
        }
    }

    static double[] processArray(double[] dataArray) {
        // TODO: Implement Functionality from Requirements.
        for (double data : dataArray) {
            System.out.println(data);
        }

        return new double[0];
    }

}

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
_________________

// numbers.txt

10 34.45 56.67 32.12 34.45 56.67 89.87 76.65 55.33 22.34 12.23

__________________

// Lab5.java

import java.io.File;
import java.util.Scanner;

public class Lab5 {

public static void main(String[] args) {
String inFileName;

if (args.length > 1) {
inFileName = args[0];
} else {
Scanner console = new Scanner(System.in);
System.out.println("Enter a Filename: ");
inFileName = console.nextLine();
}

double[] myData = readArray(inFileName);
double[] results = processArray(myData);

// TODO: Display Results...
displauArray(results);
}

private static void displauArray(double[] results) {
       System.out.println("Smallest = "+results[0]);
       System.out.println("Largest = "+results[1]);
       System.out.println("Average = "+results[2]);
       System.out.println("Sum = "+results[3]);
       System.out.println("Count of Larger than Average = "+results[4]);
       System.out.println("Largest Difference = "+results[5]);
      
   }

   static double[] readArray(String filename) {
File inFile = new File(filename);
double[] data=null;
if (inFile.canRead()) {
try {
Scanner fileScanner = new Scanner(inFile);
int count = fileScanner.nextInt();
data = new double[count];

for (int i = 0; i < count; i++) {
data[i] = fileScanner.nextDouble();
  
}
  
fileScanner.close();
  
  
} catch (Exception e) {
return new double[0];
}
} else {
System.out.println("Can't read file.");
return new double[0];
}
return data;
}

static double[] processArray(double[] dataArray) {
double min=dataArray[0],max=dataArray[0];
double sum=0.0,avg=0.0,diff=0.0;
int aboveAvgCnt=0;
double largestDiff=Math.abs(dataArray[0]-dataArray[1]);


for(int i=0;i<dataArray.length;i++)
{
   if(min>dataArray[i])
   {
       min=dataArray[i];
   }
   if(max<dataArray[i])
   {
       max=dataArray[i];
   }
   sum+=dataArray[i];
}
avg=sum/dataArray.length;
for(int i=0;i<dataArray.length;i++)
{
   if(dataArray[i]>avg)
   {
       aboveAvgCnt++;
   }
}

for(int i=0;i<dataArray.length-1;i++)
{
   diff=Math.abs(dataArray[i]-dataArray[i+1]);
   if(largestDiff<diff)
   {
       largestDiff=diff;
  
   }
}

double result[]={min,max,avg,sum,aboveAvgCnt,largestDiff};


return result;
}

}

____________________________

Output:

Enter a Filename:
numbers.txt
Smallest = 12.23
Largest = 89.87
Average = 47.077999999999996
Sum = 470.78
Count of Larger than Average = 5.0
Largest Difference = 33.2

_______________Could you plz rate me well.Thank You