Question

Write a JAVA program to read a list of nonnegative integers and to display the largest integer, the smallest integer and the average of all the integers. The user indicates the end of the input by entering a negative sentinel value that is not used in finding the largest, smallest and average values. The average should be a value of type double so that it is computed a fractional part.

* Java program free from syntax, logic and run time errors

* Code optimisation: no unnecessary assignment of variables and calculations

* (one of them has 0 input). Descriptive block and inline comments included.

Answer 1

CODE:
OUTPUT:

CODE:

//for taking input from the console
import java.util.Scanner;

//class name and public is for publically accesible
public class Main {

    /*
     * 1. public : it is a access specifier that means it will be accessed by
     * publically. 2.static : it is access modifier that means when the java program
     * is load then it will create the space in memory automatically. 3.void : it is
     * a return type i.e it does not return any value. 4.main() : it is a method or
     * a function name.
     */
    public static void main(String[] args) {

        // Integer.MAX_VALUE gives max integer value
        // Smallest set to Integer.MAX_VALUE, we don't have to worry about
        // any special case where smallest
        // doesn't have a value .It helps to avoid edge cases.
        int smallest = Integer.MAX_VALUE;
        int largest = 0, count = 0;
        double average = 0, total = 0;
        int number;
        // creating object of Scanner class
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter integers :");
        while (true) {
            // Taking input
            number = sc.nextInt();
            // when number is smaller than 0, stop taking input(break the loop)
            if (number <= -1) {
                break;
            } else {
                // storing total number of elements
                count = count + 1;
            }
            // if number is smaller than smallest, then put the number into smallest
            if (number < smallest) {
                smallest = number;
            }
            // if number is larger than largest, then put the number into largest

            if (number > largest) {
                largest = number;
            }

            total = total + number;
            // finding average by sum of elements by total numbers
            average = (total / count);
        }
        // closing the scanner object to ensure to prevent any resource leak
        sc.close();
        // printing the outputs
        System.out.println("The smallest number : " + smallest);
        System.out.println("The largest number : " + largest);
        System.out.println("The average is : " + average);
    }

}