The Secret Behind the iPhone Calculator App

Similar to the traditional pocket calculator design, the calculator software on the iPhone has a vertical interface with basic features such as addition, subtraction, multiplication, division, percentage, and memory clearing.

To perform more complex calculations, users often have to install additional software from a third party, not realizing that the default application already has all the necessary features, but is hidden. Apple almost never mentions this.

Standard interface of the calculator app on iPhone when held vertically

This secret feature was only accidentally discovered when users rotated the default Calculator interface on the iPhone horizontally. In landscape mode, the numeric keypad and all basic features (which appear when in portrait mode) are reduced to the right corner, leaving nearly 2/3 of the interface for much more complex function buttons.

Here, users can calculate roots, logarithms, sin/cos/tan, decimals, powers, process cached results of previous calculations... and many other formulas. According to estimates, the calculator application on iPhone provides enough formulas for accountants or students at different levels.

When rotated horizontally, the application has full functionality for accounting use.

The software even has a “2nd” key and a “Random” key to generate random digit results. The number Pi (π) also makes an appearance here.

When rotating the interface from portrait (standard keyboard) to landscape ( scientific keyboard) or vice versa, the user does not lose the results of previously performed calculations. To delete numbers or calculations, simply swipe left or right on the screen. Pressing and holding on the icon on the home screen will copy the most recent result on the device.

Khanh Linh

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Source: https://vtc.vn/bi-mat-an-sau-ung-dung-may-tinh-cua-iphone-ar768138.html