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exp in SBCL is wrong?

Tags:

lisp

sbcl

CL-USER> (exp 1)
2.7182817

Why? It should be 2.7182818 (rounded from 2.7182818284590452353602874713526624977572470936999595749669...)

SBCL 1.0.29.11.debian

like image 515
Sergii Dymchenko Avatar asked Dec 21 '22 18:12

Sergii Dymchenko

1 Answers

It is a rounding error inherent in the IEEE single-float format.

CL-USER> (exp 1.0d0)
2.718281828459045d0
like image 115
Svante Avatar answered Jan 11 '23 19:01

Svante
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