add commonsense and expression_functions

1 files changed, 6 insertions, 2 deletions

diff --git a/src/complex.rs b/src/complex.rs
index 642122f..e498234 100644
--- a/src/complex.rs
+++ b/src/complex.rs
@@ -2,7 +2,7 @@ use std::num::ParseFloatError;
 use std::str::FromStr;
 use std::f64::consts::E;
 
-#[derive(Clone, Copy, Default)]
+#[derive(Clone, Copy, Default, Debug)]
 pub struct Complex {
     pub real: f64,
     pub imag: f64,
@@ -103,7 +103,11 @@ impl FromStr for Complex {
             }
         } else {
             if s.contains('i') {
-                c.imag = s[..s.len() - 1].parse()?;
+                if s.len() == 1 {
+                    c.imag = 1.0;
+                } else {
+                    c.imag = s[..s.len() - 1].parse()?;
+                }
             } else {
                 c.real = s.parse()?;
             }