Question

Write a program that accepts a file name from the command line, then initializes an array with test data using that text file as an input. The file should contain floating-point numbers (use double data type). The program should also have the following methods:
* getTotal. This method should accept a one-dimensional array as its argument and return the total of the values in the array.
* getAverage. This method should accept a one-dimensional array as its argument and return the average of the values in the array.
* getHighest. This method should accept a one-dimensional array as its argument and return the highest value in the array.
* getLowest. This method should accept a one-dimensional array as its argument and return the lowest value in the array.

Answer 1

Answer:

Complete code is given below:

Explanation:

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.util.Arrays;

import java.util.Scanner;

public class ArrayCalcs {

private int size;

String [] parts =null;

// based on number of elements in file, array will create.

double[] arr=null;

public void readFile(String file){

try{

FileReader fr = new FileReader(file+".txt");

BufferedReader br = new BufferedReader(fr);

String line = br.readLine();

int count = 0;

while (line != null) {

parts = line.split(" ");

for( String w : parts)

{

count++;

}

line = br.readLine();

}

size=count;

arr=new double[size];

for(int i=0;i<size;i++){

arr[i]=Double.parseDouble(parts[i]);

}

// System.out.println(count);

// System.out.println(Arrays.toString(parts));

System.out.println(Arrays.toString(arr));

} catch (FileNotFoundException ex){

System.out.println("This file does not exist");

} catch (IndexOutOfBoundsException e){

System.out.println("Thie file has more than 7 lines");}

catch (IOException e) {

System.out.println(e.getMessage());

}

}

public double getTotal(){

double sum=0.0;

for(double d:arr){

sum=sum+d;

}

return sum;

}

public double getAverage(){

double avg=getTotal()/arr.length;

return avg;

}

public double getHighest(){

double high=arr[0];

for(int i=0;i<arr.length-1;i++){

if(arr[i] > high)

high = arr[i];

}

return high;

}

public double getLowest(){

double low=arr[0];

for(int i=0;i<arr.length-1;i++){

if(arr[i] < low)

low= arr[i];

}

return low;

}

public static void main(String[] args) {

Scanner s = new Scanner(System.in);

System.out.println("Enter file name:");

String file=s.next();

ArrayCalcs ac=new ArrayCalcs();

ac.readFile(file);

System.out.println(" Highest Element: "+ac.getHighest());

System.out.println("Lowest Element: "+ac.getLowest());

System.out.println("Total: "+ac.getTotal());

System.out.println("Average: "+ac.getAverage());

}

}