Javascript gives wrong result for 0.6 / 0.2 = 2.9999999999999996 instead of 3

Question

Why 'divide' arithmetic calcualtion for 0.6 / 0.2 = 2.9999999999999996 gives javascript function, instead of 3

Answer 1

Because in binary, 0.6 is not exactly 0.6, and 0.2 is not exactly 0.2.

"Not exactly 0.6" / "Not exactly 0.2" = "Not exactly 3"

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In computers, all numbers are represented in binary. When you write 0.6, the computer actually stores...

1/2 + 1/16 + 1/32 + 1/256 + ...

Similarly for 0.2:

1/8 + 1/16 + 1/128 + 1/256 + ...

Consequently, you get a result along the lines of diving all those items, which comes out to something that is almost, but not quite, entirely unlike 3.

Consider working with integers only if possible.

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Further edit: You can actually observe this in the browser's console.

You see? the result of the division is extremely close to, but not exactly the expected answer.