add 'e' as evaluable functor for Euler's constant (#832)

2021-02-20 18:31:47 -07:00
parent a9fe2ab5c4
commit eb5ea28bcd
2 changed files with 9 additions and 0 deletions
--- a/src/arithmetic.rs
+++ b/src/arithmetic.rs
@@ -278,6 +278,12 @@ impl<'a> ArithmeticEvaluator<'a> {
            &Constant::Rational(ref n) => self
                .interm
                .push(ArithmeticTerm::Number(Number::Rational(n.clone()))),
+            &Constant::Atom(ref name, _) if name.as_str() == "e" => {
+                self.interm
+                    .push(ArithmeticTerm::Number(Number::Float(OrderedFloat(
+                        f64::consts::E,
+                    ))))
+            }
            &Constant::Atom(ref name, _) if name.as_str() == "pi" => {
                self.interm
                    .push(ArithmeticTerm::Number(Number::Float(OrderedFloat(