after refactoring

#include <stdio.h>
int main(void) {
    int H, W, m, n;
    while (1) {
        scanf("%d%d", &H, &W);
        if (H == 0 || W == 0) { break; }
        m = n = 1;
        while (m <= H && n <= W) {
            if (m != 1 && m != H && n != 1 && n != W) {
                printf("."); n++; continue;
            }
            printf("#");
            // tail? then newline
            if (n == W) { printf("\n"); n = 1; m++; }
            else { n++; }
        }
        printf("\n");
    }
    return 0;
}