Java Program to count the occurrence of a number

Program

import java.util.*;
public class CountOccurence
{
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		System.out.println("Enter the size of an array:");
		int size = sc.nextInt();
		int arr[] = new int[size];
		System.out.println("Enter the array elements:");
		for(int i = 0; i < size ; i++)
			arr[i] = sc.nextInt();
		System.out.println("Enter the item to check:");
		int item = sc.nextInt();
		int count = 0;
		for(int i = 0; i < size ;i++)
			if(arr[i] == item)
				count++;
		if(count > 0)
			System.out.println("Element found for " + count + " times");
		else
			System.out.println("Element not found");
	}
}

This Java program counts the occurrences of a specific number in an array provided by the user.

1. User Input for Array Size:

   • The program prompts the user to input the size of the array.
   • The size is stored in the variable size.

2. Array Initialization:

   • An integer array arr of size size is created.

3. User Input for Array Elements:

   • The program asks the user to input the elements of the array.
   • A for loop iterates from 0 to size - 1, and each element is stored in the array.

4. User Input for Item to Check:

   • The program prompts the user to input the number they want to check for in the array.
   • This value is stored in the variable item.

5. Count Occurrences:

   • A variable count is initialized to 0.
   • A for loop iterates through the array, and for each element that matches item, count is incremented.
   • The program uses a for loop to traverse the array and compare elements.
   • The program tracks how many times a specific number appears in the array by incrementing the count variable when a match is found.

6. Display Result using Conditional Statements:

   • An if-else block is used to determine whether the item exists in the array and display the appropriate message.
   • If count > 0, the program prints the number of times item was found in the array.
   • If count == 0, it prints that the element was not found.

Output 1:

Enter the size of an array:
10
Enter the array elements:
12
34
5656
23
78
12
45
12
678
32
Enter the item to check:
12
Element found for 3 times

Output 2:

Enter the size of an array:
6
Enter the array elements:
11
21
31
41
51
61
Enter the item to check:
71
Element not found