Java Program to Count Positive Negative and Zero from Array

Java Program to Count Positive Negative and Zero from Array

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In the previous article, we have seen Java Program to Remove Even Numbers from Array

In this article we are going to see how we can count the number of negative, positive and zero elements by using Java programming language.

Java Program to Count Positive Negative and Zero from Array

Array is a data structure which stores a fixed size sequential collection of values of single type. Where with every array elements/values memory location is associated. Each array elements have it’s own index where array index starts from 0.

In Array set of variables referenced by a single variable name and it’s array index position. It is also called as a container object which contains elements of similar type.

Declaration of an array:

dataType[] arrayName; (or)                              //Declaring an array
dataType []arrayName; (or)
dataType arr[];

Instantiation of an Array:

arrayName = new datatype[size];                    //Allocating memory to array

Combining both Statements in One:

dataType[] arrayName = new dataType[size] //Declaring and Instantiating array

Initialization of an Array:

arrayName[index-0]= arrayElement1             //Initializing the array

...

arrayName[index-s]= arrayElementS

Combining all Statements in One:

dataType arrayName[ ]={e1,e2,e3};               //declaration, instantiation and initialization

Let’s see different ways to count positive, negative and zero element in an array.

Method-1: Java Program to Count Positive Negative and Zero from Array By Static Initialization of Array Elements

Approach:

  • Declare and initialize an array.
  • Iterate the array.
  • If array element is greater than zero then it is positive number so increase the positive count.
  • If array element is smaller than zero then it is negative number so increase the negative count.
  • Else element is equal to zero then it is zero so increase the zero count.
  • Then print the result.

Program:

public class Main
{
    public static void main(String args[])
    {
        // Array with elements
        int arr[] = {10,-15,1,-30,50,7,1,0,0};
        
        //variable to store count of positive, negative and zero elements
        //initialized with to 0
        int positive=0,negative=0,zero=0;
        
        //Loop to count positive,negative and zero elements
        for(int row=0;row<arr.length;row++)
        {
                //if array element is greater than zero it is positive
                if(arr[row]>0)
                    //incrementing positive count value
                    positive++;
                    
                //if array element is smaller than zero it is negative
                else if(arr[row]<0)
                    //incrementing negative count value
                    negative++;
                //if array element is not greater or smaller than zero then it is equal to zero
                else
                    //incrementing zero count value
                    zero++;
        } 
        
        System.out.println("Number of positive elements are : "+positive);
        System.out.println("Number of negative elements are : "+negative);
        System.out.println("Number of zero elements are : "+zero);
    }
}
Output:

Number of positive elements are : 5
Number of negative elements are : 2
Number of zero elements are : 2

Method-2: Java Program to Count Positive Negative and Zero from Array By Dynamic Initialization of Array Elements

Approach:

  • Take the array size input from user.
  • Take the input of array elements.
  • Print the array.
  • Then Iterate the array.
  • If array element is greater than zero then it is positive number so increase the positive count.
  • If array element is smaller than zero then it is negative number so increase the negative count.
  • Else element is equal to zero then it is zero so increase the zero count.
  • Then print the result.

Program:

import java.util.*;

public class Main
{
    public static void main(String args[])
    {
        Scanner scan = new Scanner(System.in);
        // Array with elements
        int arr[] = null;
        
        System.out.print("Enter the length of the array : ");
        int length = scan.nextInt();
        arr = new int[length];
        int iter;  
        
        // Entering the array elements
        System.out.println("Enter the array elements : ");
        for(iter=0;iter<arr.length;iter++)
            arr[iter]=scan.nextInt();
            
        System.out.println("The array elements are : ");
        //For Loop to print the elements
        for(iter=0;iter<arr.length;iter++)
        {
                System.out.print(arr[iter]+" ");
        }   
        
        //variable to store count of positive,negative and zero elements
        //initialized with to 0
        int positive=0,negative=0,zero=0;
        
        //Loop to count positive,negative and zero elements
        for(int row=0;row<arr.length;row++)
        {
                //if array element is greater than zero it is positive
                if(arr[row]>0)
                    //incrementing positive count value
                    positive++;
                    
                //if array element is smaller than zero it is negative
                else if(arr[row]<0)
                    //incrementing negative count value
                    negative++;
                //if array element is not greater or smaller than zero then it is equal to zero
                else
                    //incrementing zero count value
                    zero++;
        } 
        
        System.out.println("\nNumber of positive elements are : "+positive);
        System.out.println("Number of negative elements are : "+negative);
        System.out.println("Number of zero elements are : "+zero);
    }
}
Output:

Enter the length of the array : 10
Enter the array elements : 
1  -2  3  -4  5  0  6  0  -7  8 
The array elements are : 
1  -2  3  -4  5  0  6  0  -7  8 
Number of positive elements are : 5
Number of negative elements are : 3
Number of zero elements are : 2

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