A magic number can also be a number with special, hardcoded semantics. For example, I once saw a system where record IDs > 0 were treated normally, 0 itself was "new record", -1 was "this is the root" and -99 was "this was created in the root". 0 and -99 would cause the WebService to supply a new ID.
In general, this is a really good answer…about magic constants. But "magic number" can also refer to special constants in file formats, debugging constants, etc. At the very least, I think it's important to make it clear that the magic numbers you're talking about are only one type of magic number, even from a "programming point of view".
Have you consider Magic Number Table and Decimal method of doing subnetting? Especially for the purpose of passing exam I would consider decimal way in contrast to binary way. There are lots of resources on subnetting- vidoes and books; I recommend W. Odom's book for CCNA cert which has both methods. In addition here is Magic Number table which will help u solving Class C subnetting fast. see ...
Magic Number Table and Decimal method of doing subnetting for purpose ...
Series 4-Magic Number Class A Subnetting Link: Work in progress Attached are 3 handouts that I use throughout the Series: Page 1 – Standard VLSM chart -Used a reference when we get into talking about avoiding overlap and starting from large to small. Page 2 – Packetlife.net IPv4 Cheat Sheet -Awesome reference to convert from DDN to CIDR to ...
This is the simplest code for magic number which I have found to be working with almost all examples. And the point is - it works beyond the logic of the definition given.