Program to subtract two matrices / 2D arrays

Program
Time Complexity: O(m*n) where m and n are the number of rows and columns in matrix.
Space Compexity: 0(1)
m=max(r1,r2)
n=max(c1,c2)

#include <stdio.h>
int main()
{
    printf("****************************************************");
    printf("\n****************************************************");
    printf("\n**    WAP to subtract two matrices or 2D arrays   **");
    printf("\n**            Created by Sheetal Garg             **");
    printf("\n**            Assistant Professor                 **");
    printf("\n**            Phone No:9467863365                 **");
    printf("\n****************************************************");
    printf("\n****************************************************\n");
    int r1, c1, r2, c2, i, j, a[5][5], b[5][5], c[5][5], p = 1;
    printf("Enter no. of rows and columns of first matrix\n");
    scanf("%d%d", &r1, &c1);
    printf("Enter no. of rows and columns of second matrix\n");
    scanf("%d%d", &r2, &c2);
    if (r1 == r2 && c1 == c2)
    {
        printf("enter elements of first matrix\n");
        for (i = 0; i < r1; i++)
            for (j = 0; j < c1; j++)
                scanf("%d", &a[i][j]);
        printf("enter elements of second matrix\n");
        for (i = 0; i < r2; i++)
            for (j = 0; j < c2; j++)
                scanf("%d", &b[i][j]);
        for (i = 0; i < r1; i++)
            for (j = 0; j < c1; j++)
                c[i][j] = a[i][j] - b[i][j];
        printf("\nThe first matrix is\n");
        for (i = 0; i < r1; i++)
        {
            for (j = 0; j < c1; j++)
                printf("%d\t", a[i][j]);
            printf("\n");
        }
        printf("\nThe second matrix is\n");
        for (i = 0; i < r2; i++)
        {
            for (j = 0; j < c2; j++)
                printf("%d\t", b[i][j]);
            printf("\n");
        }
        printf("\nThe resultant matrix subtraction is\n");
        for (i = 0; i < r1; i++)
        {
            for (j = 0; j < c1; j++)
                printf("%d\t", c[i][j]);
            printf("\n");
        }
    }
    else
        printf("\nmatrices cant be subtracted");
    return 0;
}

Output 1

****************************************************
****************************************************
**    WAP to subtract two matrices or 2D arrays   **
**            Created by Sheetal Garg             **
**            Assistant Professor                 **
**            Phone No:9467863365                 **
****************************************************
****************************************************
Enter no. of rows and columns of first matrix
3
4
Enter no. of rows and columns of second matrix
2
3

matrices cant be subtracted

Output 2

enter elements of first matrix
4 3 2
5 4 2
6 2 1
enter elements of second matrix
2 3 4
1 2 1
2 1 1

The first matrix is
4       3       2
5       4       2
6       2       1

The second matrix is
2       3       4
1       2       1
2       1       1

The resultant matrix subtraction is
2       0       -2
4       2       1
4       1       0