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kamarada / Linux-Kamarada-GNOME

Archived on GitHub. Moved to GitLab: https://gitlab.com/kamarada/Linux-Kamarada-GNOME/
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GUI - Accessories - Calculator #3

Closed vinyanalista closed 4 years ago

vinyanalista commented 5 years ago

Linux Kamarada needs a calculator.

vinyanalista commented 5 years ago

GNOME Calculator is part of the GNOME core apps.

Can be installed with:

# zypper in gnome-calculator gnome-calculator-lang
vinyanalista commented 4 years ago

Integration between GNOME Shell and GNOME Calculator is provided by the gnome-shell-search-provider-gnome-calculator package. It allows one to do calculations right from GNOME Shell.

vinyanalista commented 4 years ago

Working on 15.1-RC2-Build37.8.

vinyanalista commented 4 years ago

Some curious test cases:

Mind Reading

  1. Have someone pick a number between 1 and 9.
  2. Now have him use a calculator to first multiply it by 9, and then multiply it by 12,345,679 (notice there is no 8 in that number.).
  3. Have the person show you the result so you can tell him the original number he selected. How? If he selected 5, the final answer is 555,555,555. If he selected 3, the final answer is 333,333,333. The reason: 9 x 12345679 = 111111111. You multiplied your digit by 111111111. (By the way, that 8-digit number (12,345,679) is easily memorized: only the 8 is missing from the sequence.)

Source: https://www.curiousmath.com/articles/Calculator-Tricks.html

How to Check a Calculator's Accuracy

Many people think that unless a calculator shows some gross abnormality, then it is performing correctly. Unfortunately, this is not true. A calculator can appear to be functioning normally and actually be erring its functions without its operator's knowledge. Yes, electronics can make mistakes! But, engineers have a simple test that will check for such errors, and they usually begin a work day by performing it. This test does not require the manipulation of complicated formulas. It uses a "magic number."

The magic number is "370." Enter this magic number, 370, into your computer. Multiply it by 3. The computer total should show 1110.

Enter 370 into your computer once again. Multiply it by 6. The computer total should show 2220.

Enter 370 into your computer a third time. Multiply it by 9. The computer total should show 3330.

Enter 370 into your computer a fourth time. Multiply it by 12. The computer total should show 4440.

Realize that multiplying 370 by a number divisible by 3 will produce a total that has the multiple of three as its first 3 digits. For example, 27 is 9 threes If you multiply 370 by 9, the result is 9990.

Source: https://bizfluent.com/how-2078214-check-calculators-accuracy.html