Javascript Calculator - Tear it apart

Project Feedback
#1

Here is my calculator: https://codepen.io/jmarkell/full/Ldoxvr/
I think I caught most of the errors, but I am sure I missed some. Let me know if you can break it.

I want to figure out how to get the keypad working with each button on the calculator, but I am not quite sure how to go about binding events for click and keyboard efficiently. And I have determined I really suck at design and picking color schemes.

Well anyway, any feedback you can provide will be greatly appreciated. Thanks for taking a look!

Edit: This link is now updated to the fixed site.

#2

Issue #1) I should be able to click the following and get 1

1/3=*3

Instead I get 0.9999

Issue #2) I should be able to click the following and get 0.3

0.1+0.2 =

Instead I get 2.1
I did not look at your code, but I believe the above result occurs because you probably only allow 1 decimal point during a series of operations before = is clicked.

Issue #3) I should be able to click the following and clear out all entries (showing a 0)

3+5+8 ← ← ← ← ←

Instead I get 3 + 5 + displayed

Issue #4) I should not be able to enter the following, but I can.

*9*9*9*9

Issue #5) I should not be able to enter the following, but I can.

.3.3.6.6

There are probably more issues, but this you give you something to work on for now.

#3

Thanks for the feedback! I believe I have fixed all the issues other than 1. My new calculator is here: https://codepen.io/jmarkell/full/vRwyGX/

I am forced to wonder how I should go about solving issue #1 since there should always be some error when dealing with floating point numbers.

#4

You need to come up with a strategy to round the number and some level of precision.

#5

Divided by 0 gives NaN

#6

Alright, I fixed the division by zero error and another error I found when you hit = and then type a number.

Revision 3 is here: https://codepen.io/jmarkell/full/Ldoxvr/

I’ll work on updating my rounding function tomorrow. Thanks for the help!

#7

I cant seem to add or subtract by a two digit number after getting a result. 5+5= returns 10 but if I try to add 65 to that it clears and displays 5 as the beginning of a new equation.

Also I can’t use negative numbers.

#8

Yep, I see that error now. I’m going to work on it some more tomorrow. I’m missing too many little things and my brain’s dead. Thanks for finding it!

#9

I think I fixed it now. Also, this calculator is not setup for negative numbers.

#10

Alright, it now takes care of issue 1. Apparently the problem is that I went ahead and tried to do the rounding for the calculator. If I keep full precision, the javascript already handles it correctly.

Thank you all for feedback. If you find anything else that is not working please let me know!

#11