Cargo.toml

@@ -6,5 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-evalexpr = "11.0.0"
+evalexpr = "7.2.0"
 termion = "1.5.6"

README.md

@@ -7,7 +7,33 @@ Features expression evaluation, variable assignment, an interactive mode, pretty
 output, and a variety of preset constants and functions focused on pure mathematics,
 data science, and computer science.
 
-More information is available on the [project wiki](https://git.vwolfe.io/valerie/qm/wiki).
+## Constants
+
+| Name           | Tokens     | Type  | Value               |
+| -------------- | ---------- | ----- | ------------------- |
+| Euler's Number | `e`        | `f64` | `2.718281828459045` |
+| Golden Ratio   | `phi`, `ϕ` | `f64` | `1.618033988749895` |
+| Pi             | `pi`, `π`  | `f64` | `3.141592653589793` |
+| Root Two       | `√2`       | `f64` | `1.414213562373095` |
+
+
+## Built-in functions
+
+### Mathematics
+
+- `fix`: fix a float to *n* digits.
+- `log`: logarithm. Defaults to natural logarithm (ln).
+- `sqrt`/`√`: square root. 
+
+### Data Science
+
+- `avg`: average an arbitrary set of numbers.
+
+### Computer Science
+
+- `bin`: convert an integer to a binary string or vice versa.
+- `hex`: convert an integer to a hexadecimal string or vice versa.
+- `oct`: convert an integer to an octal string or vice versa.
 
 ## Libraries
 

src/helper.rs

@@ -7,22 +7,6 @@ use evalexpr::{
 use crate::util;
 
 //	Mathematics
-pub fn fix(arg: &Value) -> Result<Value, EvalexprError> {
-	let args = arg.as_tuple()?;
-
-	let count = args.len();
-	if count != 2 {
-		return Err(EvalexprError::WrongFunctionArgumentAmount { expected: 2, actual: count });
-	}
-
-	let float = args[0].as_float()?;
-	let figures = args[1].as_int()?;
-
-	let operand: f64 = i64::pow(10, figures as u32) as f64;
-	let output = f64::round(float * operand) / operand;
-	return Ok(output.into());
-}
-
 pub fn logarithm(arg: &Value) -> Result<Value, EvalexprError> {
 	let arguments: Vec<Value>;
 	let count: usize;

src/main.rs

@@ -36,7 +36,6 @@ fn main() {
 		"√2"	=>	global::ROOT_TWO,
 
 		//	math functions
-		"fix"	=>	Function::new(|arg| helper::fix(arg)),
 		"log"	=>	Function::new(|arg| helper::logarithm(arg)),
 		"sqrt"	=>	Function::new(|arg| helper::square_root(arg)),