rust-calc

A text-based calculator (a.k.a. math shell) written in Rust

• Contains a library crate and a binary crate
• Uses 64 bit arithmetics
• Function and value bindings
• Vector support
• Parallel evaluation
• Bitwise operators

Language Features

Evaluation of mathematical expressions

1.25 * 12 + cos pi
= 14

Functions and value bindings

let f(x) = sin x * cos x
Function OK

f(pi/4)
= 0.5

let p4 = pi/4
= 0.7853981633974483

Integer and floating point arithmetics

1 + 4
= 5
  0x5
  0b101

1.0 + 4.0
= 5.0

Binary and hexadecimal in- and output for integers

0b0101_1101
= 93
  0x5d
  0b1011101

0xACDC_FF10
= 2900164368
  0xacdcff10
  0b10101100110111001111111100010000

Vector support

[1,2,3.5]
= [1, 2, 3.5]

[0..10]
= [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

[0..10 : 2.5]
= [0, 2.5, 5, 7.5]

Basic arithmetic operators

((1 + 2) * 3 / 4) % 2
= 0.25

Floating-point and integer division

5 / 2
= 2.5

5 \ 2
= 2
  0x2
  0b10

C-like bitwise operators

(1 << 3) | 0xC00 ^ 0b101 & ~1
= 3084
  0xc0c
  0b110000001100

Exponents and logarithms

(e ** 2) log e
= 2

sqrt 2
= 1.4142135623730951

Trigonometric operators

sin (pi/2) * cos pi + asin (sin pi)
= -1

Vector-specific operators

len [1, 1]
= 1.4142135623730951

[1, 1] dot [2, 2]
= 4

count [1, 2, 3]
= 3

Bulk operations using vectors

[1, 2, 3] * 10
= [10, 20, 30]

2 ** [0..8]
= [1, 2, 4, 8, 16, 32, 64, 128]

Shell Features

Last evaluation result: it

> 1+2
= 3
  0x3
  0b11
> it
= 3
  0x3
  0b11

Parallel evaluation

> #:
> 1+1
> 2*2
> 3/2
> #!
= [2, 4, 1.5]

JSON file output

> #:
> let a=1
> let b=2
> let c=3
> #!
= [1, 2, 3]
> #j
{
    "a": 1,
    "b": 2,
    "c": 3,
    "d": 4,
    "e": 2.718281828459045,
    "it": [1, 2, 3],
    "pi": 3.141592653589793,
}

Installation

• Install rust 1.13 or higher
• Check out the code to some directory RUST-CALC-DIR
• Point your shell to RUST-CALC-DIR/rcalc
• Enter cargo run --release