yet-zio / yetcalc

Yet another calculator designed and developed for Android

yetCalc

The free and open source calculator developed for Android 5.0 and above using Kotlin. yetCalc's calculator mode uses the mXparser library. Large calculations are handled without device freezing and other issues, although some calculations might take time.

Modes

• (🔢)Basic Calculator
• (🧑‍🔬)Scientific Calculator
• (📏)Unit Converter
• (👨‍💻)Programmer

Features

• Themes

  • System Theme(default)
  • Dark mode🌃
  • Light mode🏙️

• Calculator

  

  

  • Support for all basic operators.
  • Progressive calculations.(results appear on top and change side by side as you change the expression)
  • Provides commonly used constants.(Some constants might result to 0 if precision setting is not high)
  • Switch between different angle measurements with ease.
  • Scientific Mode that provides various trigonometric, hyperbolic and inverse functions, calculus and iterated operators, much more.
  • Provides variable support.(only 1 variable)
  • Precision settings for precise calculations.
  • Operations like copy, cut, paste, delete are handled and results are changed accordingly.
  • Vibrations when clicking buttons?(don't know if I should have mentioned it here)
  
  

  DO NOTE: Inorder to use scientific features, the device should be in landscape mode.

• Unit Converter

  • Currency: Conversions are handled through fawazahmed0/currency-api and requires an Internet connection.
  • Length: Conversions to and from Femtometres, Picometres, Nanometres, Micrometres, Millimetres, Centimetres, Decimetres, Metres, Decametres, Hectometres, Kilometres, Inches, Feet, Yards, Miles, Nautical Miles, Megametres, Gigametres, Terametres, Petametres, Furlongs
  • Volume: Conversions to and from Microlitres, Drops, Millilitres, Cubic centimetres, Decilitres, Litres, Cubic metres, Cups(US), Cups(UK), Pints(US), Pints(UK), Quarts(US), Quarts(UK), Gallons(US), Gallons(UK), Dry, Liquid, Federal and Oil Barrels(US), Barrels(UK), Cubic inches, Cubic feet, Cubic yards, Teaspoons(US), Teaspoons(UK), Tablespoons(US), Tablespoons(UK), Fluid Ounces(US), Fluid Ounces(UK)
  • Area: Conversions to and from Square millimetres, Square centimetres, Square decimetres, Square metres, Square decametres, Square hectometres, Square kilometres, Hectares, Square miles, Acres, Square inches, Square feet, Square yards, Square nautical miles, Dunams, Tsubos, Pyeong, Cuerdas, Square megametres, Square gigametres, Square terametres, Square petametres
  • Weight/Mass: Conversions to and from Femtograms, Picograms, Nanograms, Micrograms, Carats, Milligrams, Centigrams, Decigrams, Grams, Decagrams, Hectograms, Kilograms, Newtons(Earth), Tonnes, Ounces, Pounds, Stones, Tons(US), Tons(UK), Catties, Grains, Gigagrams, Teragrams, Petagrams
  • Temperature: Conversions to and from Celsius, Fahrenheit, Kelvin, Rankine scale, Delisle scale, Newton scale, Réaumur scale, Rømer scale, Yoctokelvin, Attokelvin, Femtokelvin, Picokelvin, Nanokelvin, Microkelvin, Millikelvin, Kilokelvin, Megakelvin, Gigakelvin, Terakelvin, Petakelvin, Exakelvin, Zettakelvin, Yottakelvin
  • Speed: Conversions to and from Centimetres per second, Metres per second, Kilometres per hour, Miles per hour, Knots, Feet per second, Feet per minute, Inch per second, Mach, Furlongs per Fortnight, Bubnoff units, Natural units(speed of light)
  • Power: Conversions to and from Watts, Kilowatts, Horsepower, Ergs per second, Foot-pounds per minute, Decibel-milliwatts, Calories per hour, BTUs per hour, Tons of refrigeration.
  • Energy: Conversions to and from Electron volts, Joules, Kilojoules, Ergs, Calories, British Thermal Units, Kilowatt hours, Kilocalories, Foot-pounds
  • Pressure: Conversions to and from Atmospheres, Torrs, Pascals, Kilopascals, Kips per square inch, Pounds per square inch, Feet Sea Water(15° C), Bars, Kilograms per square centimetre, Baryes, Sthenes, Millimetres of mercury
  • Time: Conversions to and from Nanoseconds, Microseconds, Milliseconds, Jiffies, Seconds, Minutes, Hours, Days, Weeks, Fortnights, Months, Years, Decades, Centuries, Milleniums, Galactic years
  • Angle: Degrees, Radians, Gradians, Turns, Milliradians, Minutes of arc, Seconds of arc
  • Data: Bits, Nibbles, Crumbs, Bytes, Kilobits, Kibibits, Megabits, Mebibits, Gigabits, Gibibits, Terabits, Tebibits, Petabits, Pebibits, Exabits, Exbibits, Zetabits, Zebibits, Yottabits, Yobibits, Kilobytes, Kibibytes, Megabytes, Mebibytes, Gigabytes, Gibibytes, Terabytes, Tebibytes, Petabytes, Pebibytes, Exabytes, Exbibytes, Zetabytes, Zebibytes, Yottabytes, Yobibytes

• Programmer(Extended from this implementation)

  • Provides all basic operators like +, -, ×, ÷
  • Provides logical operators like AND, OR, NOT, NAND, NOR, XOR
  • Provides operations like left shift(<<) and right shift(>>)
  • Support for commonly used number systems: Binary, Octal, Decimal and Hexadecimal

Install

Or download the app from the releases page.

Note: Requires Android 5.0 and above.

Also, only download the app from sources provided by the developer.

Donations

To donate, check out Donate.md

yetcalc's Issues

Something is up with exchangerate.host

I think that the site is down and with it the API.

Add furlongs to length in converter

Self-explanatory, add the furlong measurement to length in the converter tool.

e.g. 1 US furlong is 201.168 meters

Volume conversion fails from units like Tablespoons(US), Teaspoons(UK) - Possible issue from 1.0.6

The conversion will not automatically compute, nor upon confirmation of the entry and selection via the bottom [Enter] button.

Further irony, the results field (the second measurement field) oddly seems to request manual insertion of the answer — as the cursor continues to bat it it's eye in hopes for an entry.

Congratulations on the UI, though.

programmers can't paste

hi, i am encountering one simple difficulty with this. when using the programmer mode, there seems to be no interaction to paste a value from the clipboard contents.

in calculater mode there is clearly a flashing bar | to indicate input. long pressing that area brings the system overlay offering "paste" and an overflow elipsis to reveal "auto-fill" which i guess is redundant for a calculater but who knows. also a backspace ⌫ button is present and functional.

back in programmer mode there is no indication of input, there is no response for long press anywhere. also there is no backspace. this state persists in landscape orientation.

programmers always write values and inputs by hand, and wouldn't make mistakes while doing so, but as a borky scripter i would love to use this tool too. in any case, thankyou for your time and effort.

Network permission removal in seperate release?

Hello,

so far yetCalc seems to be more stable and feature packed than other calculators i've seen.

My only concern is the network permission, if its not too much of an extra maintenance burden, could you create a 2nd release apk that has network permission removed and just have the features that require it disabled or removed?

Result overlapping menubar on Fairphone 3plus

This calculator is all I was looking for except this tiny flaw. <3

negative temperature celsius

Hi,

I'm trying to convert -4 °C to Fahrenheit.
But it doesn't seem possible to input a negative number.

What to do now?

F-Droid

Please add this app to the F-Droid main repository.

I can not read numbers

When I calculate for example 13000/30, I see that

I can not read the first numbers,

I suggest to specify the decimal number like that

F-Droid build failed

https://monitor.f-droid.org/builds/log/yetzio.yetcalc/6#site-footer

Could you please take a look?

Perfect circles

These aren't perfect circles, oval shaped

long press the delete button to delete all digits

this has already been done https://github.com/Darkempire78/OpenCalc , and I find it very convenient (Helps in solving big math examples)

PayPal not accepting transactions

Thanks for yetCalc!

I wanted to donate through PayPal but it says you cannot accept payments at the moment.

I hope you will solve soon the issues.

PayPal is a bad beast!

Missing icon in older android

In android 6 app icon is missing and shows a generic app icon.

Consider changing calculator appearance

The calculator is great and has a lot of features. I wish it looked better. Consider a design like this, which is similar to the Samsung calculator which I think has the best design among all Android calculators. This way you will also have a button for the history, a button for the converter and a button to switch to scientific mode without having to rotate the phone.

Issue when value approaches Long's max value(9223372036854775807)

Problems

• When value is greater than 9223372036854775807, the result remains same but changes on some values

Expected

• A greater value or scientific notation as result

Causes

• Double losing precision

Possible Solution

• Compare with the maximum value not represented with scientific notation(Double), found to be 9999999

operation error

Example
1*2=2
Multiply the result (2) using the *
It appears on the left.. Then you cannot do any calculation with more than one step

Remove existing tab from selection menu

★But retain current tab's title

precision issue

Option to dsable vibration

Some people don't like the vibration. It would be better to be able to be disabled.

Amoled friendly black theme

Add pure black/amoled friendly theme.

Weird Button Shape

There's a problem where the shapes of the buttons for the calculator are shaped correctly. I have a Samsung Galaxy Z Flip 4 and my guess is that it's just a scaling issue seeing as the phone is much taller than most other phones out there.

Bubnoff units are completely off

Bubnoff units (speed) convert to about .1c, consistent across various units, when they should be something like a millimeter per year. It seems like this comes from app/src/main/java/yetzio/yetcalc/component/UnitConv.kt, where the formulas in MetreperSecToBubnoff and BubnoffToMetreperSec are swapped.

Programmer mode - divide by 0 crashes the app.

The title of the issue, pretty much. Happens with all numeral systems.

Programmer mode - operation sign disappear when number system changed

Example:

• in Programmer mode choose HEX
• enter '10', enter '+'
• in history string shows '010 +'
• change number system to DEC
• in history string shows '16' without operation sign
• enter '1'
• in history string shows '161'
• press '='
• in history string shows '17'
  So when number system changed during formula entering, operation sign is disappear.
  This is very confusing.

Detailed name instead of abbreviations

Give detailed name instead of abbreviations for each

Disable Haptic Feedback Option

Due to nerve issues, haptic feedback is undesirable. Please offer option to disable it.

Use keyboard instead of dropdown menus for “1ST” and “x”

It takes too much effort to scroll and find the target using the current dropdown menu. The “x” even requires high precision of thi finger on the menu. Just allow keyboard input, it will be easier.

App can't add/subtract percentages properly

So, I really wanted to use this to replace the stock Xiaomi calculator, which I had replaced with the Google calculator, but the app cannot even calculate adding or subtracting percentages properly (I'm guessing it's just calculating the percentage in 1?).

Add units symbols in converter

A nice enhancement would be to add standard unit symbols alongside the full name of the unit in the converter.

A good start would be to simply add it between parenthesis or brackets in the string describing the units.

colors other than green in the dark theme

When I'm in a calculator all the time, I get a little tired of the green colors.

I want variety and at least a few new ones

Volume Unit Converter is seriously inaccurate

There's no way that is right. 1 cup should be 16 tablespoons

My settings:

Material you

Support for Material You colors and a generally more MD3 design would be great

Converter - 1 feet is not 11.99939 inches

Converting 1 feet to inches returns 11.999390429747026.

similarly, converting 12 inches to feet returns 1.0000508001016004.

default settings on v1.0.3

Floating calculator feature

Adding a floating calculator feature would make the app VERY handy. Like e.g. the Mi Calculator. Also a quick settings tile that would open directly the floating calculator would be very functional.

Why it isnt on Google Play?

mass unit conversion error

I tried convert from miligrams to grams (mg -> g) and saw that there is a small deviation. See 3 on last digit.

use really libre gpl3 license

totally black theme

it helps the battery a lot on some types of screens (they just turn off the pixels in completely black places)

https://github.com/Darkempire78/OpenCalc already did that

percentage(concern about intended behavior)

opencalc vs yetcalc

Currency converter improvements

Please add an option to remember last used currency in currency converter tab.
I would also like to be able to create favorites for currencies and be able to choose from them.
Or at least a search, because it is very inconvenient to search for a currency in a long list.

The program does not work with percentages.

+/- using the percent symbol does not give correct results.
Try this: 100-13%. The result will be: 99.87

Scientific functions only available in landscape screen

On my phone, scientific functions are only available in landscape screen orientation,
not in default portrait screen orientation. Moreover, user even may not know that
scientific functions are present in the app and that they must change the screen
orientation to access them.

Operations (+) and (-) in the natural set are not closed

Operations (+) and (-) in the natural set give a result in the set of real numbers.

For example, 2+2=4, but the app gives 4.0 as result.

System theme

Please add the "System Default" theme and set it as the default theme.

Not all digits are visible in portrait mode

Not all digits are shown in landscape mode. This is the result of square root 3. The first picture shows the result after calculation. I have scroll manualy to see the first digits (2nd picture). Would it be possible to reduce the number of digits or make the font smaller?

Programmer Mode: Boolean operators issue

Problems

Based on #35, the issue repeats for boolean operators such as AND, OR, NOT, NAND, NOR, XOR, LSH and RSH but everything is fine for arithmetic operators.

Expected

Remember the operator in history string and do not calculate beforehand.

Causes

Current solution only compares start index of operator with the last index.

yetCalc/app/src/main/java/yetzio/yetcalc/views/ProgramCalcActivity.kt

Lines 711 to 716 in 32d6011

	for(i in opsList){
	if(tvExp.text.toString().contains(i) && tvExp.text.toString().trim().indexOf(i) == tvExp.text.toString().trim().lastIndex){
	mViewModel.opPresent = true
	break
	}
	}

Possible Solution

Compare the last index for boolean operators.

Date difference calcularor

It would be nice to be able to compute date difference. For example like Xiaomi calculator do this:

Compact vertical layout of calculator

The keys in horizontal layout is more compact than the vertical one. If the vertical layoutt is as compact as the horizontal one, it can do what the horizontal one can do, as its result part takes less space than the horizontal layout's.

Custom units

Pls add option for custom units in convertor