Determine the network address

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1) The IP address and subnet mask are given. You need to calculate the network address: implement the getNetAddress method. Use the bitwise AND operator. Example: IP address: 11000000 10101000 00000001 00000010 (192.168.1.2) Subnet mask: 11111111 11111111 11111110 00000000 (255.255.254.0)

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Justin Smith

Level 38 , Greenfield, USA, United States

6 December 2021, 03:17

Tough task but very interesting. This topic is definitely not how I expected to start a section called "Multithreading".

SunMind

Level 29 , Stockholm, Sweden

5 January 2021, 21:57

Integer.toBinaryString(256 + (int) aByte); Why need to make addition here?

Andrei

Level 41

9 March 2021, 15:09

I am assuming because byte is up to 127 (inclusive) so you would lose some numbers from 192 but I don't understand the use of 256 here. Why 256 and not any other number?

Andrei

Level 41

9 March 2021, 15:33

Please check Guada's answer here: https://codegym.cc/help/14585

Justin Smith

Level 38 , Greenfield, USA, United States

6 December 2021, 03:17

It's filling the first 8 digits with 1s so that leading 0s aren't cut off. For example, if your byte is: 00000101, using toBinaryString will create "101" as the string. To pass validation, all 8 digits must be included. 256 + (int) aByte causes the toBinaryString to output 1111111100000101, so the 0s aren't lost. It's a lot simpler than the method I used, which use String.format and "%8s" to force it to be at least 8 characters long, then replaceAll to replace the spaces with 0s.

yehuda b

Level 23 , Beersheba, Israel

22 December 2020, 13:54

To get a string representation of the binary digits of each byte, see https://stackoverflow.com/questions/12310017/how-to-convert-a-byte-to-its-binary-string-representation