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What Did Ada Lovelace’s Program Actually Do?

twobithistory.org Essays & writing Essays & articles History & humanities Class of 2024-12 Hall of Fame
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Resurfaced independently across 5 calendar years, with breakout response in 2 of them.

submissions
7
submitters
7
observed span
2018–2024
peak thread · 129 comments
410 pts
latest 20+ return · 2024-12-16
355 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

Holy shit. I got shivers the moment I realized Sinclair actually finds and fixes a bug from the very first program written in 1843. In her “diagram of development,” Lovelace gives the fourth operation as v5 / v4. But the correct ordering here is v4 / v5. 1843! I was recently at the Musee des arts et metiers in Paris, and they have several original Pascalines on display. So many marvels packed into a very tight space, it is one…

zaroth·410-point thread·

> In her “diagram of development,” Lovelace gives the fourth operation as v5 / v4. But the correct ordering here is v4 / v5. This may well have been a typesetting error and not an error in the program that Lovelace devised. All the same, this must be the oldest bug in computing. I marveled that, for ten minutes or so, unknowingly, I had wrestled with this first ever bug. The real mark of a non-trivial program is that it…

I found this excellent article while searching for the details of Ada Lovelace's original program. Amazing how legible the thought process is as a modern day programmer! Also see this other writeup which goes into much finer detail about the algorithm: https://enigmaticcode.wordpress.com/2015/09/24/running-the-f...

skupig·3-point thread·

"Her program calculated a number that she called B7, which modern mathematicians know as the eighth Bernoulli number."

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
776

reference only — not used in Hall rules or ranking

Total comments
183

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2018-08-20What Did Ada Lovelace’s Program Actually Do?First breakout · Best threadweebst41052
2020-01-02What Did Ada Lovelace's Program Do?utopian320
2020-01-06What Did Ada Lovelace's Program Do?etxm21
2020-04-22What Did Ada Lovelace's Program Do?kristianp10
2021-02-11What Did Ada Lovelace's Program Do? (2018)ciconia30
2023-06-26What Did Ada Lovelace's Program Do? (2018)skupig31
2024-12-16What did Ada Lovelace's program actually do? (2018)Hall induction · Latest 20+ point returnmitchbob355129