Rebecca Turner 9999years

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Numeric Typeclasses - How numbers work!

Numbers in Haskell are typed of course. They also exist as instances of a numeric typeclass hierarchy. I was confused with converting and working with numbers of different types, and not being sure which functions were polymorphic and could work with different numeric types. So I created a little diagram. Do note that the typeclass hierarchy of Haskell actually does somewhat follow the hierarchy of numbers in Math.

Simple value literals

Numbers

syntax	examples	languages
decimal literals	`-123.45`	(most languages)
scientific notation	`1.23e-2`
prefix hexadecimal	`0xDEADBEEF`
prefix binary	`0b1110`
prefix octal	`0o777`

	#!/usr/bin/python
	# esc-pos-image-star.py - print image files given as command line arguments
	# to simple ESC-POS image on stdout
	# using ESC * \x21
	# scruss - 2014-07-26 - WTFPL (srsly)

	import sys
	from PIL import Image
	import PIL.ImageOps
	import struct

	### SYMBOLIC LINK FILES
	# Create a new symbolic link file named MySymLinkFile.txt in C:\Temp which links to $pshome\profile.ps1
	cd C:\Temp
	New-Item -ItemType SymbolicLink -Name MySymLinkFile.txt -Target $pshome\profile.ps1 # File
	# Target is an alias to the Value parameter

	# Equivalent to above
	New-Item -ItemType SymbolicLink -Path C:\Temp -Name MySymLinkFile.txt -Value $pshome\profile.ps1

	# Equivalent to above

	# RFC 7159 § 9
	# "An implementation may set limits on the size of texts that it accepts."

	def parse_json(text):
	if len(text) != 1:
	raise ValueError("Only accepts single character JSON values")
	return int(text[0])

	<#
	Prerequisites: PowerShell version 3 or above.
	License: MIT
	Author: Michael Klement <mklement0@gmail.com>

	DOWNLOAD and DEFINITION OF THE FUNCTION:

	irm https://gist.github.com/mklement0/8689b9b5123a9ba11df7214f82a673be/raw/Out-FileUtf8NoBom.ps1 \| iex

	The above directly defines the function below in your session and offers guidance for making it available in future

	:Namespace apl102
	(⎕IO ⎕ML ⎕WX)←0 1 3
	tok←'your_access_key'
	base←'https://botsin.space/api/v1/'
	∆h←⎕SE.UCMD 'Load HttpCommand'
	br←{t←⍵ ⎕NTIE 0 ⋄ s←2 ⎕NINFO t ⋄ ⎕NREAD t 80 s}
	putMedia←{
	h←⎕NEW ∆h
	n←⎕UCS 13 10 ⍝ \r\n
	bd←'boundary'