A very simple calculator built using vanilla HTML, CSS and JavaScript.
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Can be controlled using either mouse / touchscreen or by using the keyboard pressing the corresponding keys.
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Decimal point can be inserted using both comma or dot key on the keyboard.
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DEL deletes last digit.
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Feel free to suggest any improvements by creating an issue.
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You can also work on an already open issue and pull request when finished, so I can review the changes and eventually merge them to the base branch.