like to present to you JAVA calculator for students with input of the
string from keyboard.
The problem with paucity of buttons was sold by separation of functions onto 4 levels:
1st digitss and .
2nd sin, cos, tan, *, /, +, (), square, square root,
3d asin, acos, atan, ln, log, exp(x), (-), 10x, π, xy, n-th root,
4th sh, CH, th, ash, ach, ath, ANS (inserts the answer into the line), abs, the factorial, X.Y (variables given by user).
Levels are switched by #.
It is checked, that the speed of entry on it is mostly the same as in usual calculators. As a maximum it will be necessary fpr an operator to press button 4 times to press button, and since the majority of pressures is fallen to the numbers, then on the average it will come out near 1 pressure :)
Calculator provides approximately 16 decimal digits accuracy. For calculations with the numbers with floating point it uses class Real.java from Roar Lauritzsen.
Calculator is written under MIDP1.0 and CLDC1.0
Joystick up/down navigation on the history of entries. Down on
the first line creates a new one and deletes upper line. = dont
create a new entry in history. Pressing on joystick turns the keyboard
into insert mode.
Calculator was tested on:
Motorola E398, V620, C380, C650
SonyEricsson K700, T630, T610
Siemens C65 CX65 (Siemens version) , SX1
Nokia 6610i, N-Gage
Theoretically it must work on all telephones supporting JAVA.
JenFA for the source of File Manager, which greatly helped me, for the valuable advice and the moral support.
Busheva Maria aka RNqAM for the inspiration and for the moral support.
Strizhenko Pavel aka Proton for the testing and the project promotion.
|MIDP1.0 version Students Calculator 1.5.0 PR - recommended for all mobile phones.|
|MIDP2.0 version Students Calculator 1.5.0 PR for Motorola - Special MIDP2.0 version only for Motorola phones with Backlight control function and Fullscreen mode.|
You may leave your comments in forum or mail it to firstname.lastname@example.org
Changes in version 1.5.0 PR Release Date: March 26 , 2006:
1. New version of class Real.java without
calculation errors on some Siemens and Nokia phones now used. Separated
version for Siemens no needed now.
2. Calculation of constants was fixed.
Changes in version 1.5.0beta4 Release Date: January 7 , 2006:
1. Now you can choose length of variables
for HEX, OCT, BIN modes - 1, 2 or 4 bytes (Number
2. Drawing keyboard on some phones was fixed.
Changes in version 1.5.0beta3 Release Date: December 25 , 2005:
1. New algorithm for
string parsing and calculation.
2. Priorities of bitwise operations was fixed.
3. Converting answer to simple fraction was optimized. Now it is much faster and more precise.
4. New algorithm for saving data and drawing forms.
5. Code optimizations and bugfixes.
Changes in version 1.5.0beta2 Release Date: October 25 , 2005:
1. Each system DEC HEX OCT
BIN now has its own input history.
2. Fixed some troubles with keyboard
3. Fixed calculation priorities for functions div, or, and, mod, xor, , >>, <<
Changes in version 1.5.0beta1 Release Date: October 24 , 2005:
1. The possibility to calculate in
HEX, OCT, BIN systems was added! Some additional functions is
available in these modes, such as div, or, and,
mod, xor, not, >>, <<
2. Function "ANS to text" was replaced by "Convert ANS" This function present answer in all systems (DEC,HEX,OCT,BIN) at once.
3. New function "Past ANS" was added for direct pasting answer to string, however answer from another numeral system automatically converts to current system.
4. New formats for angle measures was added - Grads and Length of arc.
5. Great optimisation of code and graphics was made.
6. Some troubles was fixed in algorythms of string parser.
1. Repeat of action when key is held down.
Changes in version 1.12. Release Date: April 29, 2005
1. The speed of algorithm of converting answer to
simple fraction and it's accuracy was enhanced.
2. If there is "E" symbol before fraction, it means that the result of algorithm is approximate.
Changes in version 1.1. Release Date: April 27, 2005
1. All Siemens users can download now full version 1.1.
2. Fixed calculation of nroot function.