Java program to check the equality of two matrices has been shown here. Two matrices $[A]_{m \times n}$ and $[B]_{p \times q}$ are considered to be equal if both of the following conditions are satisfied

(i) Number of rows and columns are same for both of the matrices i.e. $m = p$ and $n = q$

(ii) Each elements of $A$ is equal to corresponding element of $B$ i.e. $A_{ij} = B_{ij}$ for each $i \in m$ and $j \in n$.

## 1. Java Program to check the equality of two matrices

Code has been copied
/**********************************************
Alphabetacoder.com
Java program to check equality of two matrices
***********************************************/

import java.util.Scanner;
public class MatrixEquality{
public static void main(String args[]){
//System.in is a standard input stream
// sc is the object
Scanner sc= new Scanner(System.in);
int m,n,p,q,flag=0,i,j;

//take input of the order of first matrix
System.out.print("Enter the number of row and column of first matrix=");
m=sc.nextInt();
n=sc.nextInt();

//declare first matrix
int A[][]=new int[m][n];
//take input of the first matrix
System.out.print("Enter the first matrix of order "+m+" x "+n+"=\n");
for(i=0;i<m;i++){
for(j=0;j<n;j++){
A[i][j]=sc.nextInt();
}
}
//take input of the order of second matrix
System.out.print("Enter the number of row and column of second matrix=");
p=sc.nextInt();
q=sc.nextInt();

//declare first matrix
int B[][]=new int[p][q];
//take input of the first matrix
System.out.print("Enter the second matrix of order "+p+" x "+q+"=\n");
for(i=0;i<p;i++){
for(j=0;j<q;j++){
B[i][j]=sc.nextInt();
}
}

// check if order of matrices are same
// if not same order then check each corresponding elements
if(m!=p||n!=q){
System.out.print("\nMatrices are of different order,hence not equal");
flag=1;
}
else{
//check equality of each corresponding elements
for(i=0;i<m;i++){
for(j=0;j<n;j++){
if(A[i][j]!=B[i][j]){
// inequality spotted
System.out.print("\nMatrices are not equal. Element mismatch at "+(i+1)+" row "+(j+1)+" column");
flag=1;
break;
}
}
if(flag==1)
break;
}
}
if(flag==0)
System.out.print("\nMatrices are equal");
}
}


Output

#### Case 1:

Enter the number of row and column of first matrix=3 3

Enter the first matrix of order 3 x 3=

1 2 3

4 5 6

7 8 9

Enter the number of row and column of second matrix=2 3

Enter the second matrix of order 2 x 3=

8 0 5

6 4 1

Matrices are of different order,hence not equal

#### Case 2:

Enter the number of row and column of first matrix=2 2

Enter the first matrix of order 2 x 2=

1 2

4 5

Enter the number of row and column of second matrix=2 2

Enter the second matrix of order 2 x 2=

1 2

4 5

Matrices are equal

#### Case 3:

Enter the number of row and column of first matrix=2 2

Enter the first matrix of order 2 x 2=

1 3

5 6

Enter the number of row and column of second matrix=2 2

Enter the second matrix of order 2 x 2=

1 3

5 7

Matrices are not equal. Element mismatch at 2 row 2 column