Question

LAB: How many negative numbers

Write a program that generates a list of integers, and outputs those integers, and then prints the number of negative elements. Create a method (static void fillArray(int [] array)) that uses Random to generate 50 values (Random.nextInt()), put each value in the array (make sure to pass the array in to this method as an argument). Write another method (static int printAndCountNeg(int [] array)) that prints each element’s value and count the number of negative elements in the array. This method should return the number of negative elements found. The main method should declare an array of integers of size 50, call the method fillArray and pass it the array. When this method returns, main should then call the method printAndCountneg and save the return value (number of negative values). The main method should then print out the

number of negative values in the array. Ex: the output could be : -374937618 -1863905254 -1348969776 938596197 907952957 -327993586 - 1743601907 382736921 1712532071 642907127 1002963315 -1688774920 322796671 1755144485 -1052711727 1180372010 -70992450 2066690368 -1136894786 - 909934548 715799702 -594362157 -567571763 382028023 -1240992762 - 1080900594 1649662718 -521690784 -1448427729 1571306695 -1265503370 - 732942143 2112074280 1599849666 -1171297422 -602855207 2077600781 1157281841 -722961031 -375333392 -1757317538 1075184765 6170833 2003844415 321127813 1498980166 -855345613 -536361587 262123192 -627054168 There are 26 negative elements The number should be different each time the program is run and the number of negative values is

usually is between 20-30 (25 +/- 5).

import java.util.Scanner;

public class howManyNegative {
public static void main(String[] args) {

/* Add variables as needed */

/* Type your code here. */ }

/* Add methods as needed */ }

Answer 1

JAVA CODE:

import java.util.Scanner;

import java.util.Random;

public class howManyNegative {

    public static void fillArray(int[] array){

        // Create Random object to get random integers

        Random rand = new Random();

        for(int i = 0; i < array.length; i++){

            // Generate a random number and fill in the array

            array[i] = rand.nextInt();

        }

    }

    public static int printAndCountNeg(int[] array){

        // Counter to count negative numbers

        int count = 0;

        for(int i = 0; i < array.length; i++){

            // Print the i-th array element

            System.out.print(array[i] + " ");

            // If i-th array element is negative then increment the count

            if(array[i] < 0)

                count++;

        }

        System.out.println();

        // Return number of negative elements in the array

        return count;

    }

    public static void main(String[] args) {

        // Create an array of 50 integers

        int[] array = new int[50];

        // Fill array with random numbers

        fillArray(array);

        // Print array elements and get negative numbers

        int negNum = printAndCountNeg(array);

        System.out.println("There are " + negNum + " negative elements");

    }

}

SAMPLE OUTPUT:

-324239772 -1067735606 1499012173 1481621370_889490388 -282872537 810663049 1562000466 -15 52013162 1788526429 2097402977 -526046483 -1370281474 246605407 365732940 2070770565 66919 3920 -336645625 -85657055 -2106499817 1868059590 -1888608676 -1654596591 647204677 9344640 67 -971486697 1149923031 -1760440707 -1970382073 1076693348 1095273261 1835587163 20560412 37 -306257691 89437825 1789982284 -1750117006 1431186683 537621224 -1860873101 1332211263 332429639 2145196627 -1849558321 -269335798 2102873198 -2062239488 1858278044 -1679010720 1332833308 There are 21 negative elements

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