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 -

**A**_{ij} = **B**_{ij} (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 😉

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