Erreurs décimales

0.1+0.2 = ???

• https://docs.python.org/fr/2.7/tutorial/floatingpoint.html

Python 

 Python 2.7.16 (default, Oct  7 2019, 17:36:04) 
 >>> 0.1+0.2
 0.30000000000000004
 >>> 0.1+0.2-0.3
 5.551115123125783e-17

Tcl 

 % puts [expr 0.1+0.2]
 0.30000000000000004
 % puts [expr 0.1+0.2-0.3]
 5.551115123125783e-17

Perl 

 echo "print 0.1+0.2" | perl
 0.3
 echo "print 0.1+0.2-0.3" | perl
 5.55111512312578e-17

Lisp 

 > (+ .1 .2)
 0.30000000000000004
 > (-  (+ .1 .2) .3)
 5.551115123125783e-17

OK

Numworks 

(calculatrice graphique basée Python)

• https://www.numworks.com/fr/simulateur/