**TKalk is a free, small and safe open source scientific calculator for Symbian S60-touchscreen
devices like the Nokia 5800.**

Yet another calculator for Symbian-touchscreen smartphones, why take this one? It offers correct mathematical order of operations, trigonometric functions, logarithm and other standard features plus it is

- free: no costs, no advertising
- small: download size is less than 9 KByte
- safe: Written in HTML/CSS/JavaScript (i. e. no binaries which could include hidden functions), you can just unzip the wgz-package and have a look at the source yourself to check that TKalk doesn't connect to the internet or write anything to your smartphone's memory/filesystem.

Download tkalk.wgz to your device (or to your computer and transfer it to the phone), open the file manager and tap on the file to install. An icon in the program menu will be created.

TKalk V1.2 - 19.08.2012: tkalk.wgz

Colors:

dark grey: standard key

light grey: 2nd function with Inv

violet: edit/mode/calculate

red: clear calculation/display

green: digits

Special keys:

Arrows: move cursor

Del: delete char/function

Prev: recall previous calculation

Clr: clear calculation field

Inv Clr: set display to 0

Inv: 2nd function of key

DRG: degree/radian/gradian

Inv x: store display value into x

Inv y: store display value into y

Functions:

acos(x): arccosine

asin(x): arcsine

atan(x): arctangent

cos(x): cosine

exp(x): e^x

fac(x): factorial

lg(x): logarithm (base 10)

ln(x): logarithm (base e)

log(y,x): logarithm (base y)

pow(x,y): x^y

random(): random value (0-1)

root(y,x): yth root of x

sqr(x): square

sqrt(x): square root

sin(x): sine

tan(x): tangent

Misc:

ans: last result

e: 2.7182818

E: *10^

pi: 3.1415927

x: value stored in x

y: value stored in y

TKalk V0.9 - 27.03.2011: First release

TKalk V1.0 - 11.04.2011: Gradian added, color of 'Clr' changed to red, keys centered

TKalk V1.1 - 13.06.2011: Adapt vertical key size to screen height

TKalk V1.2 - 19.08.2012: Prevent resizing when typing long lines, optical improvements