if 2 Matrices are Equal with C

#include <stdio.h>
#include <stdlib.h>
void main()
{
    int a[10][10], b[10][10];
    int i, j, row1, column1, row2, column2, flag = 1;
    printf("Enter the order of the matrix A \n");
    scanf("%d %d", &row1, &column1);
    printf("Enter the order of the matrix B \n");
    scanf("%d %d", &row2, &column2);
    printf("Enter the elements of matrix A \n");
    for (i = 0; i < row1; i++)
    {
        for (j = 0; j < column1; j++)
        {
            scanf("%d", &a[i][j]);
        }
    }
    printf("Enter the elements of matrix B \n");
    for (i = 0; i < row2; i++)
    {
        for (j = 0; j < column2; j++)
        {
            scanf("%d", &b[i][j]);
        }
    }
    printf("MATRIX A is \n");
    for (i = 0; i < row1; i++)
    {
        for (j = 0; j < column1; j++)
        {
            printf("%3d", a[i][j]);
        }
        printf("\n");
    }
    printf("MATRIX B is \n");
    for (i = 0; i < row2; i++)
    {
        for (j = 0; j < column2; j++)
        {
            printf("%3d", b[i][j]);
        }
        printf("\n");
    }
    /*  Comparing two matrices for equality */
    if (row1 == row2 && column1 == column2)
    {
        printf("Matrices can be compared \n");
        for (i = 0; i < row1; i++)
        {
            for (j = 0; j < column2; j++)
             {
                if (a[i][j] != b[i][j])
                {
                    flag = 0;
                    break;
                }
             }
        }
    }
    else
    {
        printf(" Cannot be compared\n");
        exit(1);
    }
    if (flag == 1)
        printf("Two matrices are equal \n");
    else
        printf("But, two matrices are not equal \n");
}

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