# Java Program to Find the Frequency of Odd and Given Numbers in the Given Matrix

In the previous article, we have discussed Java Program to Find the Sum of Each Row and Each Column of a Matrix

In this article we are going to see how we can write a program to find the frequency of odd and even elements in a matrix in JAVA language.

## Java Program to Find the Frequency of Odd and Given Numbers in the Given Matrix

A 3*3 Matrix is having 3 rows and 3 columns where this 3*3 represents the dimension of the matrix. Means there are 3*3 i.e. total 9 elements in a 3*3 Matrix.

Let’s understand it in more simpler way.

                   | A00   A01   A02 |
Matrix A =  | A10   A11   A12 |
| A20   A21   A22 | 3*3
• Matrix A represents a 3*3 matrix.
• A‘ represents the matrix element
• Aij‘ represents the matrix element at it’s matrix position/index.
• i‘ represents the row index
• j‘ represents the column index
• Means A00=Aij  where i=0 and j=0A01=aij where i=0 and j=1 and like this.
• Here we have started row value from 0 and column value from 0.

Let’s see different ways to Find the Frequency of Odd and Given Numbers in the Given Matrix.

### Method-1: Java Program to Find the Frequency of Odd and Given Numbers in the Given Matrix By Static Initialization of Array Elements

Approach:

• Initialize and an array of size 3×3, with elements.
• Use two for loops to iterate the rows and columns .
• Inside the for loops count all the even and odd elements using two counters.
• Print the result.

Program:

public class matrix{
public static void main(String args[])
{
// Initializing the 3X3 matrix i.e. 2D array
int arr[][] = {{19,25,32},{40,54,62},{70,20,60}};
int row, col ,oddCounter = 0, evenCounter = 0;

System.out.print("The matrix elements are : ");
printMatrix(arr);

// Loops to calculate odd and even elements on a matrix
for(row=0;row<3;row++)
for(col=0;col<3;col++)
{
if(arr[row][col]%2==0)
evenCounter++;
else
oddCounter++;
}

System.out.println("Number of odd elements in the matrix are : "+oddCounter);
System.out.println("Number of even elements in the matrix are : "+evenCounter);
}

// Function to print the matrix
static void printMatrix(int arr[][])
{
int row, col;
// Loop to print the elements
for(row=0;row<3;row++)
{
// Used for formatting
System.out.print("\n");
for(col=0;col<3;col++)
{
System.out.print(arr[row][col]+" ");
}
}
System.out.print("\n");
}
}


Output:

The matrix elements are :
19 25 32
40 54 62
70 20 60
Number of odd elements in the matrix are : 2
Number of even elements in the matrix are : 7

### Method-2: Java Program to Find the Frequency of Odd and Given Numbers in the Given Matrix By Dynamic Initialization of Array Elements

Approach:

• Declare one array of size 3×3.
• Ask the user for input of array elements and store them in the array using two for loops.
• Use two for loops to iterate the rows and columns .
• Inside the for loops count all the even and odd elements using two counters.
• Print the result.

Program:

import java.util.Scanner;
public class matrix{
public static void main(String args[])
{
//Scanner class to take input
Scanner scan = new Scanner(System.in);

// Initializing the 3X3 matrix i.e. 2D array
int arr[][] = new int[3][3];
int row, col ,oddCounter = 0, evenCounter = 0;

// Taking matrix1 input
System.out.println("\nEnter matrix elements : ");
for(row=0;row<3;row++)
for(col=0;col<3;col++)
arr[row][col] = scan.nextInt();

System.out.print("The matrix elements are : ");
printMatrix(arr);

// Loops to calculate odd and even elements on a matrix
for(row=0;row<3;row++)
for(col=0;col<3;col++)
{
if(arr[row][col]%2==0)
evenCounter++;
else
oddCounter++;
}

System.out.println("Number of odd elements in the matrix are : "+oddCounter);
System.out.println("Number of even elements in the matrix are : "+evenCounter);
}

// Function to print the matrix
static void printMatrix(int arr[][])
{
int row, col;
// Loop to print the elements
for(row=0;row<3;row++)
{
// Used for formatting
System.out.print("\n");
for(col=0;col<3;col++)
{
System.out.print(arr[row][col]+" ");
}
}
System.out.print("\n");
}
}


Output:

Enter matrix elements :
The matrix elements are :
11 21 31
10 12 11
13 14 15
Number of odd elements in the matrix are : 6
Number of even elements in the matrix are : 3

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