Java Programming | Counting positive,negative,even,odd numbers from array

Introduction

This is a tutorial for counting positive, negative, even, odd numbers from arrays. The program is given below that takes numbers from users counts the +ve,-ve,even,odd numbers and prints them. The program is extendable. Go enjoy the program. Lets begin………….

Program for counting positive, negative, even, odd numbers from array in java.

//import Scanner as we require it.
import java.util.Scanner;

// the name of our class its public
public class ArrayCount {
	//void main
		public static void main (String[] args)
		{
			//declare int
			int i,x,a[] = new int[10];
			//declare int as set them 0
			int n=0,p=0,e=0,o=0;

			//Declare input as scanner
			Scanner input = new Scanner(System.in);

			//Take input for arrays
			for(i=0;i<5;i++)
			{
			 System.out.println("Enter Number :");
			 a[i] = input.nextInt();
			}

			//count
			for(i=0;i<5;i++)
			{
				if(a[i]<0)
					n++;
				else
					p++;

				x=a[i]%2;
				if(x==0)
					e++;
				else
					o++;
			}

			//print
			System.out.println("Total Even Numbers = "+e);
			System.out.println("Total Odd Numbers = "+o);
			System.out.println("Total Negative Numbers = "+n);
			System.out.println("Total Positive Numbers = "+p);
		}
}

Output

Enter Number :
1
Enter Number :
-2
Enter Number :
-3
Enter Number :
4
Enter Number :
5
Total Even Numbers = 2
Total Odd Numbers = 3
Total Negative Numbers = 2
Total Positive Numbers = 3

How does it work

  1. You enter the number.
  2. The number is saved in respective array.
  3. The numbers from arrays are taken and tested if even or odd or +ve or -ve.
  4. The respective counters are increase.
  5. The counters are printed.

Extending it

The program can be extended by taking counter of prime numbers. Try it. Extend it.

Explanation.

  1. Import the Scanner.
  2. Declare the class as public
  3. Add the void main function
  4. Declare input as Scanner.
  5. Add a for loop.
  6. Add system.out.println() function with the message to enter number.
  7. Take the inputs and save it in arrays.
  8. Add one more loop to count the different types of numbers.
  9. Add system.out.println() function to print the counters.

At the end.

You learnt creating the Java program for Counting positive, negative, even, odd numbers from arrays. So now enjoy the program.

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