You are correct that the address has issues - The Flat number is missing.
1. The model number may be incorrect. At the minimum, this model number should show up for support. 2. There are better laptops out there.
...-L); ++i) if(e[i]) d[j++] = 20+i; for(; printf("Enter a number between %d and %d: ", L, H) && scanf("%d", &k) && ...