learnjava/InputSumAverage.java at main · michaelkolesidis/learnjava · GitHub

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* Input Sum Average

* Take double numbers as input and outputs their sum and their average value.

* Should be used with text file as input, as there is no exit

* condition for scanner.

* Use:

* $ cat text.txt | java Test > output.txt

* text.txt:

* 1

* 2

* 3

* Output: (in file output.txt)

* Sum: 6.0000

* Average: 2.0000

import java.util.Scanner; // Import the Scanner class

import java.util.ArrayList; // Import the ArrayList class

class InputSumAverage {

public static void main(String[] args) {

ArrayList<Double> nums = new ArrayList<Double>(); // Create an ArrayList object

Scanner scans = new Scanner(System.in); // Create a Scanner object

while (scans.hasNextLine()) { // Scan until there are no more lines to scan

double num = scans.nextDouble(); // Parse double from scanned string

nums.add(num); // Add each scanned number to ArrayList

}

scans.close(); // Stop scanning

double sum = 0;

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

sum += nums.get(i); // Calculate the sum

}

double average = sum / nums.size();

System.out.printf("Sum: %.4f\n", sum); // Print the sum

System.out.printf("Average: %.4f\n", average); // Print the sum

}

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