C program to find sum of border elements of a matrix

#include<stdio.h>
int main()
{
    int m, n;
    int i,j;
    printf("Enter row & column size: ");
    scanf("%d %d", &m, &n);
    int arr[m][n];
    int sum = 0;

    for(i=0; i<m; i++)
    {
        for(j=0; j<n; j++)
        {
            printf("arr[%d][%d]",i,j);
            scanf("%d", &arr[i][j]);
        }
        printf("\n");
    }
    printf("displaying values of array\n");
    for(i=0; i<m; i++)
    {
        printf("\t");
        for(j=0; j<n; j++)
            printf("%d ", arr[i][j]);

        printf("\n");
    }

    for(i=0; i<m; i++)
    {
        for(j=0; j<n; j++)
        {
            if(i==0 || i==m-1)
                sum+=arr[i][j];
            else if(j==0 || j==n-1)
                sum+=arr[i][j];
        }
    }

    printf("Sum of the border elements: %d",sum);

    return 0;
}