src/main.rs

@@ -12,22 +12,8 @@ pub fn parse_and_calc(s: &str) -> Float {
     nodes::Nodes::from_str(s).unwrap().evaluate()
 }
 
-pub fn get_significant_digits(n: &Float) -> usize {
-    let raw_string = format!("{n}");
-
-    let mut significant_digits = raw_string.len() - 1;
-    for (i, _) in raw_string.char_indices() {
-        if !raw_string[i..raw_string.len()].contains(|c| matches!(c, '1'..'9')) {
-            significant_digits = i;
-            break;
-        }
-    }
-
-    significant_digits
-}
-
 fn main() {
-    let input = match env::args().skip(1).reduce(|x, a| a + &x) {
+    let input = match env::args().nth(1) {
         Some(s) => s,
         None => {
             let mut buf = String::new();
@@ -36,7 +22,5 @@ fn main() {
         }
     };
 
-    let result = parse_and_calc(&input);
-
-    println!("{result:.0$}", get_significant_digits(&result).clamp(0, 6));
+    println!("{:.3}", parse_and_calc(&input));
 }

src/nodes/evaluate.rs

@@ -40,8 +40,6 @@ fn collapse_toplevel(nodes: &mut Vec<Node>, mut end: usize) {
     {
         match &mut nodes[start..end][index + 1] {
             Node::Number(n) => match variant {
-                Function::Sqrt => n.sqrt_mut(),
-
                 Function::Sine => n.sin_mut(),
                 Function::ArcSine => n.asin_mut(),
                 Function::Cosine => n.cos_mut(),

src/nodes/from_str.rs

@@ -1,4 +1,3 @@
-use core::f64;
 use std::str::FromStr;
 
 use rug::{Float, float::ParseFloatError, ops::CompleteRound};
@@ -10,7 +9,6 @@ impl Node {
         Ok(match s {
             "c" => Self::Number(Float::with_val(PREC, 299_792_458)),
             "A" => Self::Number(Float::with_val(PREC, 6.02214076e23)),
-            "pi" => Self::Number(Float::with_val(PREC, f64::consts::PI)),
             _ => Self::Function(s.parse()?),
         })
     }
@@ -21,8 +19,8 @@ impl TryFrom<char> for Operator {
         match value {
             '+' => Ok(Self::Plus),
             '-' => Ok(Self::Minus),
-            '*' | '×' => Ok(Self::Mult),
-            '/' | '÷' => Ok(Self::Div),
+            '*' => Ok(Self::Mult),
+            '/' => Ok(Self::Div),
             '^' => Ok(Self::Exp),
             _ => Err(value),
         }
@@ -32,8 +30,6 @@ impl FromStr for Function {
     type Err = String;
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         match s {
-            "sqrt" => Ok(Self::Sqrt),
-
             "sin" => Ok(Self::Sine),
             "asin" => Ok(Self::ArcSine),
             "cos" => Ok(Self::Cosine),

src/nodes/mod.rs

@@ -40,8 +40,6 @@ enum Operator {
 
 #[derive(Debug, Copy, Clone, PartialEq)]
 enum Function {
-    Sqrt,
-
     Sine,
     ArcSine,
     Cosine,

src/nodes/tests.rs

@@ -1,18 +1,9 @@
-use core::f64;
 use std::str::FromStr;
 
 use rug::Float;
 
 use crate::nodes::{Function, Node, Nodes, Operator, PREC};
 
-#[test]
-fn implicit_mult() {
-    assert_eq!(
-        Nodes::from_str("10 sin(10)").unwrap().evaluate().to_f64(),
-        -5.440211108893698
-    );
-}
-
 #[test]
 fn constants() {
     assert_eq!(
@@ -23,10 +14,6 @@ fn constants() {
         Nodes::from_str("A").unwrap().evaluate().to_f64(),
         6.02214076e23
     );
-    assert_eq!(
-        Nodes::from_str("pi").unwrap().evaluate().to_f64(),
-        f64::consts::PI
-    );
 }
 
 #[test]