GDRs calculator: ver. 1.0.0 released with new data
This project implements calculations for the Greenhouse Development Rights climate protection framework, which supports an emergency climate stabilization program while preserving the right of all people to a global middle class level of development.
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IC(1) General Commands Manual IC(1)NAME
ic - integer calculator
SYNOPSIS
ic [expression]
EXAMPLES
ic # Start the calculator
ic 250 300+ # Start calculator with 550 on the stack
DESCRIPTION
Ic is a simple RPN (Reverse Polish Notation) calculator, used for small calculations and base conversions. All calculations are done using
32 bit integers. The standard input is usually a keyboard and the standard output requires a device with a 'termcap' entry. The program
starts by interpreting any <args> as commands, where the separation between arguments is considered to be the same as the ENTER key. For
example,
"ic 692 784+
After reading the arguments input is from the keyboard.
Stack Operations
The operation of this program is similar to an RPN calculator. A six level stack is used. The ENTER key pushes the stack up one level. For
example, '12+5' is entered as '12 ENTER 5 +".
The top two entries on the stack are exchanged by the x command, and the stack is rolled down one (popped) by the p key. The top of the
stack may be cleared by pressing the back-space key. The whole stack and the registers are initialized by a z.
Numeric Entry
The input and output bases are initially decimal, but they may be changed using the i and o commands. The i command changes both bases, but
the o command changes just the output base. These commands take a one character argument of h, d, o or b to change to Hexadecimal, Deci-
mal, Octal or Binary. While the input base is hexadecimal the letters a through f are used to represent the decimal values 10 through 15.
When the input base is decimal: multiply, divide and remainder are signed, otherwise they are performed unsigned.
The output base may also be changed to ASCII (a), this causes the least significant 7 bits of a value to be displayed as a character. To
input an ASCII value the translate (t) command may be used, it accepts one character as its argument.
Calculations
The arithmetic operations supported are: Negate ('.'), Add ('+'), Subtract ('-'), Multiply ('*'), Divide ('/'), and Remainder ('%'). The
logical (Boolean) operations available are: NOT ('~'), AND ('&'), OR ('|'), and EXCLUSIVE-OR ('^').
After one of these operations the last top of stack value is saved. It may be restored by pressing l (L).
Saving Results
Ten temporary registers are available. The Store (s) command followed by a digit ('0'..'9') will copy the top of the stack to the specified
register. The Recall (r) command pushes the contents of a register onto the top of the stack.
If the Store command is followed by a '+' preceding the digit, then the top of the stack will be added to the specified 'accumulator' reg-
ister.
Values may also be written to a file. The w command writes the top of the stack, using the current output base, to a file called 'pad' in
the current directory. If the user does not have write access to the current directory then the file /tmp/pad_$USER is used as the scratch
pad. The scratch pad file is erased on the first use of the w command within each new invocation of 'ic'.
Miscellaneous
The Quit (q) key causes an immediate exit. The m command temporarily leaves ic by invoking the shell as a sub-process. For help while
using ic, hit the h key. If an erroneous key is pressed the bell will sound.
Command Summary
Note that many commands have an alternative key-code available on the extended AT keyboard. This aids entry by including most commands on
the right side of the keyboard.
ENTER Enter (push up)
BS (DEL) Clear top of stack
h Help
i Input base (h, d, o, b)
l (PGDN) Last top of stack
m MINIX shell
o Output base (h, d, o, b, a)
p (DOWN) Pop stack (roll down)
q (END) Quit
r (LEFT) Recall (0-9)
s (RIGHT) Store [+] (0-9)
t Translate (char)
w (PGUP) Write top of stack to scratch pad
x (UP) Exchange top of stack
z (HOME) Zero all state
. Change sign
+ (+) Add
- (-) Subtract
* Multiply
/ Divide
% (sh/5) Remainder
(tilde) Not
& And
| Or
^ Exclusive-or
Author
Ic was written by Terrence W. Holm.
IC(1)