Editing Computer program (section)

===Analytical Engine===
[[File:Diagram for the computation of Bernoulli numbers.jpg|thumb|right|Lovelace's description from Note G]]
In 1837, [[Jacquard machine|Jacquard's loom]] inspired [[Charles Babbage]] to attempt to build the [[Analytical Engine]].<ref name="eniac-ch1-p16">{{cite book
  | last = McCartney
  | first = Scott
  | title = ENIAC – The Triumphs and Tragedies of the World's First Computer
  | publisher = Walker and Company
  | year = 1999
  | page = [https://archive.org/details/eniac00scot/page/16 16]
  | isbn = 978-0-8027-1348-3
  | url = https://archive.org/details/eniac00scot/page/16
  }}</ref>
The names of the components of the calculating device were borrowed from the textile industry. In the textile industry, yarn was brought from the store to be milled. The device had a ''store'' which consisted of memory to hold 1,000 numbers of 50 decimal digits each.<ref name="sco-ch1-p14">{{cite book
  | last = Tanenbaum
  | first = Andrew S.
  | title = Structured Computer Organization, Third Edition
  | publisher = Prentice Hall
  | year = 1990
  | page = [https://archive.org/details/structuredcomput00tane/page/14 14]
  | isbn = 978-0-13-854662-5
  | url = https://archive.org/details/structuredcomput00tane/page/14
  }}</ref> Numbers from the ''store'' were transferred to the ''mill'' for processing. The engine was programmed using two sets of perforated cards. One set directed the operation and the other set inputted the variables.<ref name="eniac-ch1-p16" /><ref>{{cite journal
  | first = Allan G.
  | last = Bromley
  | author-link = Allan G. Bromley
  | year = 1998
  | url = http://profs.scienze.univr.it/~manca/storia-informatica/babbage.pdf
  | title = Charles Babbage's Analytical Engine, 1838
  | journal = [[IEEE Annals of the History of Computing]]
  | volume = 20
  | number = 4
  | pages = 29–45
  | doi = 10.1109/85.728228
  | s2cid = 2285332
  | access-date = 2015-10-30
  | archive-date = 2016-03-04
  | archive-url = https://web.archive.org/web/20160304081812/http://profs.scienze.univr.it/~manca/storia-informatica/babbage.pdf
  | url-status = live
  }}</ref> However, the thousands of cogged wheels and gears never fully worked together.<ref name="sco-ch1-p15">{{cite book
  | last = Tanenbaum
  | first = Andrew S.
  | title = Structured Computer Organization, Third Edition
  | publisher = Prentice Hall
  | year = 1990
  | page = [https://archive.org/details/structuredcomput00tane/page/15 15]
  | isbn = 978-0-13-854662-5
  | url = https://archive.org/details/structuredcomput00tane/page/15
  }}</ref>

[[Ada Lovelace]] worked for Charles Babbage to create a description of the Analytical Engine (1843).<ref>{{citation
 |author1 = J. Fuegi
 |author2 =J. Francis
 |title = Lovelace & Babbage and the creation of the 1843 'notes'
 |journal = Annals of the History of Computing
 |volume = 25
 |issue = 4
 |date=October–December 2003
 |doi = 10.1109/MAHC.2003.1253887
 |pages = 16, 19, 25}}</ref> The description contained Note G which completely detailed a method for calculating [[Bernoulli number]]s using the Analytical Engine. This note is recognized by some historians as the world's first ''computer program''.<ref name="sco-ch1-p15"/>