CalcPad for Android

Summary

Calcpad - cool calculator is a simple mathematical formula calculator. You can define your own constants and functions. In addition to handling floating point arithmetic, CalcPad takes care of your big-decimal arithmetic needs as well. Plus, you can stop fighting with your on-screen keyboard and opt for the Text-to-speech(TTS) function to kick off your calculations.

Link to the Android Market
Link to the Amazon appstore

About CalcPad

CalcPad is a simple mathematical formula calculator.
In addition to standard function calculator, define your own constants and functions the user can extend the functionality.
In addition to the double-precision floating point arithmetic, arbitrary-precision decimal (Big decimal) arithmetic (you can specify the number of decimal places) can be.
The result and formula can be audio output by Text-to-speech(TTS).
For small devices, voice input function formula, select completions, and features the history of input and gesture input.

Writing Formulas

Formula is the same as normal. Numbers, operators, use parentheses.
The last result is stored as a constant "ans".

Examples

1+2*3/4+5^(6/7)
ans*2

Blank

Number of expressions, operators, space contained between the parentheses are ignored.

Operators

+ Addition(Weak)
- Subtraction(Weak)
* Multiplication(Strong)
/ Division(Strong)
^ Power(Strong)

Priorities are as arithmetic operators. When you join without parentheses strong operator and weak operators are arithmetic operators stronger than before.

Comment

String("//") is treated as a comment. Description of constants and functions can be used.

User defined constants

A number often used "user-defined constant" can be named as.
"Constant name" = "formula" represented.

Examples

c=2.99792458e-8

User defined functions

The User defined function can be described as "function name" = "formula".
The arguments in written expression: $0 - $9. The first argument is $0.

Examples

LengthCircle=2*PI*$0 // Circumference
AreaCircle=PI*($0^2) // Area of a circle
Dice=floor(1+random($0)) // Dice(1-6)
Fib=floor(1/sqrt(5)*(((1+sqrt(5))/2)^$0-((1-sqrt(5))/2)^$0)) // Fibonacci number

Check the user-defined functions and constants

Menu "Check Settings" user-defined configuration information is displayed, you can change.

Commands

$vars
Show and edit the user defined functions and constants
$clear
Erase all settings and history

Pre-defined constants

The following constants are built in advance. In the formula can be written as a number.

PI = 3.141592653589793

E = 2.718281828459045

DeciamlPrecision constant

DecimalPrecision is zero or more, and arbitrary-precision big decimal calculations, the number of decimal places represented DecimalPrecision.
The negative value less than zero, do the usual floating-point calculations (default)

Examples

DecimalPrecision=-1 // Double-precision floating-point calculations
10000000000000000-1
ans=1.0e16

DecimalPrecision=1 //big decimal calculation

10000000000000000-1
ans=999999999999999

Speech Constant

Speech constant is controls of the audio output.

Speech=0

0 : Disable audio output (default)
1 : Only result
2 : Only formula
3 : formula and result
4 : Only define formula
7 : All

TextSize Constant

TextSize changes size of the Text

Example
TextSize=120.0

OutputVisibility Constant

OutputVisibility specifies the output display area.

OutputVisibility=0 : Visible
OutputVisibility=1 : Invisible

Pre-defined functions (floating point, double precision)

abs(x)	the absolute value
acos(a)	the arc cosine of an angle, in the range of 0.0 through pi.
asin(a)	the arc sine of an angle, in the range of -pi/2 through pi/2
atan(a)	the arc tangent of an angle, in the range of -pi/2 through pi/2
atan2(y, x)	Converts rectangular coordinates (x, y) to polar (r, theta).
cbrt(a)	the cube root of a double value
ceil(a)	the smallest (closest to negative infinity) value that is not less than the argument and is equal to a mathematical integer.
cos(a)	trigonometric cosine of an angle.
cosh(x)	the hyperbolic cosine of a value.
exp(a)	Euler's number e raised to the power of a value.
expm1(x)	e^x -1
floor(a)	largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer.
hypot(x,y)	sqrt(x^2 +y^2)
log(a)	natural logarithm (base e) of a value.
log10(a)	the base 10 logarithm of a value.
log1p(x)	the natural logarithm of the sum of the argument and 1.
max(a, b)	the greater of two values.
min(a, b)	the smaller of two double values.
pow(a,b)	the value of the first argument raised to the power of the second argument.
random(x)	a value with a positive sign, greater than or equal to 0.0 and less than x.
rint(a)	the value that is closest in value to the argument and is equal to a mathematical integer.
signum(d)	the signum function of the argument; zero if the argument is zero, 1.0f if the argument is greater than zero, -1.0f if the argument is less than zero.
sin(a)	the trigonometric sine of an angle
sinh(x)	the hyperbolic sine of a value.
sqrt(a)	the positive square root of a value
tan(a)	the trigonometric tangent of an angle
tanh(x)	the hyperbolic tangent of a value.
degrees(r)	Converts an angle measured in radians to an approximately equivalent angle measured in degrees.
radians(d)	an angle measured in degrees to an approximately equivalent angle measured in radians.
ulp(d)	the size of an ulp of the argument.

Pre-Defined function (Big decimal : arbitrary-precision)

abs(x)	the absolute value of a value.
max(a, b)	the greater of two values.
min(a, b)	the smaller of two values.
pow(a,b)	the value of the first argument raised to the power of the second argument.
down(x,s)	s decimal digits rounded down
round(x,s)	Rounded decimal digits s
up(x,s)	s decimal digits rounded up

Text-To-Speech

Text-To-Speech (TTS). Also known as "speech synthesis", TTS enables your Android device to "speak" text of your language.

If TTS is not supported in your language, CalcPad trys to speak in English.

Voice Recognition

Speech input adds another dimension to staying in touch. Because CalcPad use Google's Voice Search Engine, formula representation is insufficient. For example, '*' is not 'multiply', but 'asterisk' and '/' is not 'divide', but 'slash'.

If Speech Input is not supported in your language, CalcPad trys to recognize in English.

Gestures Input

Touch screens are a great way to interact with applications on mobile devices. With a touch screen, users can easily tap, drag, fling, or slide to quickly perform actions in CalcPad. If gesturefile('gestures') exists in SD-card, CalcPad uses external gesture file. This means that you can customize gesture as you like.