Patarakin в 18:04, 28 августа 2022

2022-08-28T18:04:59Z

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	[[Category:Scripting Tutorials]]		[[Category:Scripting Tutorials]]
	~~[[Category:Math Tutorials]]~~

Patarakin: 1 версия импортирована

2022-07-21T08:33:16Z

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scratch>TheTrillion: Minor thing.

2021-05-29T19:19:40Z

Minor thing.

Новая страница

This tutorial goes over the basics of '''converting numbers into binary'''.

== Explanation ==
Binary is a base-2 numerical system that only uses two characters: <code>0</code> and <code>1</code>

Using binary in Scratch [[project]]s allows for very simple encoding and decoding of values. Because [[Cloud Data|cloud variables]] can only use numbers, converting strings into binary can allow for more advanced cloud storage.

==Converting Numbers to Binary==
This program requires one [[sprite]] and four [[variable]]s. The following variables are required:

* <sb>(binary)</sb>
* <sb>(bit)</sb>
* <sb>(i)</sb>
* <sb>(temp)</sb>

Once these variables have been created, the script below should be added to convert a number to binary:

<scratchblocks>
when green flag clicked
broadcast (number to binary v)

when I receive [number to binary v]
set [bit v] to [0]
set [binary v] to [] // Set binary to nothing
ask [Insert numerical value] and wait
set [temp v] to (answer)
repeat until <(temp) = [0]>
set [bit v] to ((temp) mod [2]) // If temp is an odd number, the remainder of temp / 2 is one, so that specific bit is 1, otherwise, that specific bit is 0
set [binary v] to (join (bit)(binary)) // Binary reads from right to left: ..., 16, 8, 4, 2, 1
set [temp v] to ([floor v] of ((temp) / (2))) // Divide the temp by two and round down to get the next bit
end
repeat until <(length of (binary)) > [7]> // Each byte has 8 bits. If the binary output string is shorter than 8, there need to be zeros in front of it so that it has 8 bits
set [binary v] to (join [0](binary))
end
forever
say (binary)
end
</scratchblocks>
Likewise, the script below should be added to convert binary to numbers:

<scratchblocks>
when green flag clicked
broadcast (binary to number v)

when I receive [binary to number v]
ask [Insert binary value] and wait
set [i v] to [0]
set [binary v] to [] // Set binary to nothing
repeat (length of (answer))
change [i v] by [1]
if <not<<(letter (i) of (answer)) = [0]> or <(letter (i) of (answer)) = [1]>>> then // Check to make sure it is binary
forever
say [Invalid input]
end
else
set [binary v] to (join (binary)(letter (i) of (answer))) // Set binary to the answer
end
end
set [bit v] to [0]
set [i v] to [0]
repeat (length of (binary))
change [i v] by [1]
set [bit v] to (((bit) * [2]) + (letter (i) of (binary))) // Function to convert binary string to number
end
forever // Ex. 1001 = 9; 0*2 + 1 = 1; 1*2 + 0 = 2; 2*2 + 0 = 4; 4*2 + 1 = 9;
say (bit)
end
</scratchblocks>

== Example Projects ==
The following is an example project that converts numbers to binary and back:
* [[projects:311313216|Binary Translator v1.2]] 

== See Also ==
* [[wikipedia:Binary number|Binary number]] on Wikipedia

[[Category:Scripting Tutorials]]
[[Category:Math Tutorials]]

Binary Conversion - История изменений

Patarakin в 18:04, 28 августа 2022

Patarakin: 1 версия импортирована

scratch>TheTrillion: Minor thing.