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.

Example:
If matrix 1 =
1 2 3
4 5 6
7 8 9

And matrix 2 =
1 2 3
4 5 6
7 8 9

Output: Both matrices are equal.

Required knowledge:

Basic C programming, For loop, Array, Matrix

Equality of matrix

Checking whether two matrices are equal or not is very simple and fundamental. 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).
Equal matrices
Both the matrices are of same dimension and also their corresponding elements are equal. Hence both Matrix A and Matrix B are equal.

Program:

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

#include <stdio.h>

int main()
{
    int A[3][3], B[3][3];
    int row, col, isEqual;

    /*
     * Reads elements in first matrix from user
     */
    printf("Enter elements in matrix A of size 3x3: \n");
    for(row=0; row<3; row++)
    {
        for(col=0; col<3; col++)
        {
            scanf("%d", &A[row][col]);
        }
    }

    /*
     * Reads elements in second matrix from user
     */
    printf("\nEnter elements in matrix B of size 3x3: \n");
    for(row=0; row<3; row++)
    {
        for(col=0; col<3; col++)
        {
            scanf("%d", &B[row][col]);
        }
    }

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

    for(row=0; row<3; row++)
    {
        for(col=0; col<3; 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
X
_
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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