Question

What will the code below output? Explain your answer.

(0.1 + 0.2);
(0.1 + 0.2 == 0.3);

Answer 1

The code will output 0.30000000000000004 and False.

Step-by-step explanation:

The code below will output the following:

(0.1 + 0.2) = 0.30000000000000004

(0.1 + 0.2 == 0.3) = False

When performing floating point arithmetic in programming languages, there can be precision errors due to the way numbers are represented in binary. In this case, adding 0.1 and 0.2 results in a very small rounding error, which is why the first calculation doesn't equal 0.3 exactly. As a result, the second calculation evaluates to False.