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   Josh Justice (codingitwrong@tdd.social)'s status on Thursday, 24-Apr-2025 03:18:17 JST Josh Justice

   Are there mainstream languages whose floating points are not implemented with IEEE 754, so 0.1 + 0.2 actually does equal 0.3? Because it seems uninformed to make fun of JavaScript for that if other languages follow the floating point standard with the same limitations.

   • Alfred M. Szmidt repeated this.
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     Daniel Kochmański (jackdaniel@functional.cafe)'s status on Thursday, 24-Apr-2025 03:18:09 JST Daniel Kochmański

     in reply to

     @CodingItWrong float is just a wrong type to do that. You may ude language with rational numbers (like common #lisp), or use ratios provided by gmp.

     1/10 + 2/10 = 3/10

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     Jonathan Yu (jawnsy@mastodon.social)'s status on Thursday, 24-Apr-2025 03:18:36 JST Jonathan Yu

     in reply to

     @CodingItWrong Maybe if they use arbitrary precision math for everything but that seems like it would be very slow

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     Alfred M. Szmidt (amszmidt@mastodon.social)'s status on Thursday, 24-Apr-2025 03:18:36 JST Alfred M. Szmidt

     in reply to

     • Jonathan Yu

     @jawnsy It isn't slow, this happens in Lisp. @CodingItWrong

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     Alfred M. Szmidt (amszmidt@mastodon.social)'s status on Thursday, 24-Apr-2025 03:20:16 JST Alfred M. Szmidt

     in reply to

     @CodingItWrong
     * (let ((zero-dot-three (+ 0.1 0.2))) (and (eq zero-dot-three 0.3) (= zero-dot-three 0.3)))
     T