ce — Calculator (Easy)

ce is an easy to use calculator for people born in the common era.

Build

Calculator (Easy) is easy to build:

$ make

Calculator (Easy) is easy to install:

$ make install

Usage

Calculator (Easy) is easy to use:

$ ce 2+2
4

$ ce '(e^pi)-pi'
19.9990999791895

$ ce '(log(exp(2))*phi-sin(pi/2))^2'
5

$ echo 3*5 | ce
15

Operators and Functions

The following basic operators are supported by ce:

Operator	Description
+,-,*,/	add, subtract, multiply, and divide
d	roll dice. "3d6" will roll 3 six-sided dice
^	exponentiation
!	factorial. Evaluates as Γ(x+1) for non-integers.
sin	Basic Trig
cos	"
tan	"
csc	"
sec	"
cot	"
sqrt	square root
log	computes the natural (base e) logarithm
exp	raises e to the power of the supplied argument

Builtin Constants

Symbol	Description
e	Euler's number; base of the natural log
pi	Circle constant; ratio of circumference to diameter
phi	Golden ratio; ½(1+√5)

interactive-mode

Interactive-mode is reached by running $ ce -i When in interactive-mode, the user is presented with a prompt. The user may input an an expression, followed by pressing enter. The result will be presented like so:

$ ./ce -i
interactive-mode
>>> sqrt(5)
2.23606797749979    [0]

>>>

The result is printed, followed by a number in [brackets]. The number in [brackets] is used to recall previous results. For example:

$ ./ce -i
interactive-mode
>>> sqrt(5)
2.23606797749979    [0]

>>> 1 + [0]
3.23606797749979    [1]

>>> [1]/2
1.61803398874989    [2]

>>>

Furthermore, brackets can contain not only integer literals, but expressions and nested brackets too:

$ ./ce -i
interactive-mode
>>> 1+1
2                   [0]

>>> [1-1] + 1
3                   [1]

>>> [3-[0]]
3                   [2]

>>>

To exit interactive-mode, simply type 'q':

$ ./ce -i
interactive-mode
>>> q
$