Comparing Objects

AP Computer Science A· difficulty 4/5

Why is <code> if (0.1 + 0.2 == 0.3) </code> unreliable?

A
$Always works$
B
$Round-off error in floating-point representation$
check_circle
C
$0.1 isn't a valid number$
D
$Doubles can't be compared$

Explanation

Binary FP cannot represent 0.1 exactly; 0.1+0.2 = 0.30000000000000004.

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forward Predict my AP score

Related questions

csa-r2-fix-002
What is wrong with this method?…
chevron_right
csa-obj-008
For <codeString a = new String("hi"); String b = new String("hi");</code — what is <codea == b</code and <codea.equals(b)</code?…
chevron_right
csa-bool-045
<codenull.equals(s)</code causes…
chevron_right

auto_awesomeAll Tools question_answerHomework Q&A menu_bookAP & SAT Prep timelineLearn Mode