aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

Data commit

Browse source
This commit is contained in:
Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Task/Approximate-equality/Common-Lisp/approximate-equality.lisp Normal file
View file

@ -0,0 +1,10 @@
(defun approx-equal (float1 float2 &optional (threshold 0.000001))
"Determine whether float1 and float2 are equal; THRESHOLD is the
maximum allowable difference between normalized significands of floats
with the same exponent. The significands are scaled appropriately
before comparison for floats with different exponents."
(multiple-value-bind (sig1 exp1 sign1) (decode-float float1)
(multiple-value-bind (sig2 exp2 sign2) (decode-float float2)
(let ((cmp1 (float-sign sign1 (scale-float sig1 (floor (- exp1 exp2) 2))))
(cmp2 (float-sign sign2 (scale-float sig2 (floor (- exp2 exp1) 2)))))
(< (abs (- cmp1 cmp2)) threshold)))))