Question 1

Does the calculator understand implicit multiplication, like "2sin(x)"?

Accepted Answer

Yes. Writing `2sin(pi/4)` works exactly like `2*sin(pi/4)`, and the same applies to cases like `2(3+4)` or `xy`. You never need to type the multiplication sign between a number and a directly adjacent variable, function, or parenthesis.

Question 2

What changes between radian, degree and gradian mode?

Accepted Answer

The selected mode affects both the input and the output of every trigonometric function: in degree mode, `sin(90)` computes the sine of 90 degrees (result 1), while in radian mode the same `sin(90)` would use 90 radians (a very different value). Inverse functions (asin, acos, atan) respect the mode on their output too: `asin(1)` returns 90 in degree mode, but π/2 in radian mode. The current mode indicator is always visible above the expression field to prevent this classic mistake.

Question 3

How does the "ans" variable work, and how do I create my own variables?

Accepted Answer

After any calculation, `ans` holds the last result and can be used in the next one, for example `ans*2`. To create your own variable, type `name = expression`, like `x = 5` or `radius = 3.5`; from then on, `x` or `radius` can be used in any following calculation, and the variables panel lists every active one, with options to reuse or remove each.

Question 4

Does the history tape stay saved if I close the tab?

Accepted Answer

Yes, every calculated line (expression and result) is saved in your browser via localStorage and stays available on your next visit. Clicking a row on the tape brings that expression back into the text field, ready to edit or recalculate; named variables, however, are not saved between sessions, only during the current one.

Question 5

Why doesn't "0.1 + 0.2" always come out to exactly "0.3"?

Accepted Answer

It's a well-known effect of binary floating-point representation, used by nearly every digital calculator: not every decimal number has an exact binary representation, so operations like 0.1 + 0.2 can carry a tiny residue. This calculator shows the rounded result (0.3) by default, but never hides the issue: whenever that noise is present, a "view exact value" button reveals the full binary value behind the rounding.

Question 6

Can I convert the result to binary, octal or hexadecimal?

Accepted Answer

Yes, the base conversion panel automatically shows the last result in all four bases (decimal, binary, octal, hexadecimal), as long as it is an integer within the safe precision range. Fractional results are refused by default, but a toggle lets you explicitly truncate the decimal part, always flagging when that happens. To convert an arbitrary number between arbitrary bases without calculating anything first, use the catalog's dedicated base converter.

Question 7

What do the memory buttons (M+, M-, MR, MC) do?

Accepted Answer

M+ adds the current result to memory, M- subtracts it, MR inserts the stored memory value at the cursor position in the expression field, and MC clears the memory. It's the same behavior as a single-memory physical calculator, useful for holding an intermediate value while you compute something else.

Question 8

Are there bitwise operators (AND, OR, XOR, bit shifts) for developers?

Accepted Answer

Yes, in a dedicated panel: AND, OR, XOR, NOT and bit shifts (left, signed right, unsigned right), all operating on signed 32-bit integers, the same semantics used by JavaScript's own bitwise operators. A button copies the calculator's current result straight into the first operand.

Scientific Calculator