# C program to check whether two matrices are equal or not

Write a C program to enter elements in two matrices and check whether both matrices are equal or not. C program to check whether elements of two matrices are equal or not. Logic to check if two matrices are equal or not in C programming.

Example

Input

```Input elements of matrix1:
1 2 3
4 5 6
7 8 9

Input elements of matrix2:
1 2 3
4 5 6
7 8 9```

Output

`Both matrices are equal`

## Required knowledge

Basic C programming, For loop, Array

### Equality of matrix

Two matrices are said to be equal if and only if they are of same size and they have equal corresponding entries. Equality of two matrices A and B can be defined as -

Aij = Bij (Where 1 ≤ i ≤ m and 1 ≤ j ≤ n). Both the matrices are of same dimension and also their corresponding elements are equal. Hence both Matrix A and Matrix B are equal.

## Program to check matrix equality

``````/**
* C program to check whether two matrices are equal or not
*/

#include <stdio.h>

#define SIZE 3 // Matrix size

int main()
{
int A[SIZE][SIZE];
int B[SIZE][SIZE];

int row, col, isEqual;

/* Input elements in first matrix from user */
printf("Enter elements in matrix A of size %dx%d: \n", SIZE, SIZE);
for(row=0; row<SIZE; row++)
{
for(col=0; col<SIZE; col++)
{
scanf("%d", &A[row][col]);
}
}

/* Input elements in second matrix from user */
printf("\nEnter elements in matrix B of size %dx%d: \n");
for(row=0; row<SIZE; row++)
{
for(col=0; col<SIZE; col++)
{
scanf("%d", &B[row][col]);
}
}

/* Assumes that the matrices are equal */
isEqual = 1;

for(row=0; row<SIZE; row++)
{
for(col=0; col<SIZE; col++)
{
/*
* If the corresponding entries of matrices are not equal
*/
if(A[row][col] != B[row][col])
{
isEqual = 0;
break;
}
}
}

/*
* Checks the value of isEqual
* As per our assumption if isEqual contains 1 means both are equal
* If it contains 0 means both are not equal
*/
if(isEqual == 1)
{
printf("\nMatrix A is equal to Matrix B");
}
else
{
printf("\nMatrix A is not equal to Matrix B");
}

return 0;
}``````

Output

```Enter elements in matrix A of size 3x3:
1 2 3
4 5 6
7 8 9

Enter elements in matrix B of size 3x3:
1 2 3
4 -5 6
7 8 9

Matrix A is not equal to Matrix B```

Happy coding 😉 