add (^) as an evaluable factor, re: #39

2018-09-01 13:48:04 -06:00
parent db36958504
commit 78ea3f5441
9 changed files with 279 additions and 34 deletions
--- a/src/prolog/machine/machine_errors.rs
+++ b/src/prolog/machine/machine_errors.rs
@@ -233,7 +233,8 @@ pub enum EvalError {
 //    IntOverflow,
 //    Undefined,
 //    Underflow,
-    ZeroDivisor
+    ZeroDivisor,
+    NoRoots
 }

 impl EvalError {
@@ -243,7 +244,8 @@ impl EvalError {
 //            EvalError::IntOverflow => "int_overflow",
 //            EvalError::Undefined => "undefined",
 //            EvalError::Underflow => "underflow",
-            EvalError::ZeroDivisor => "zero_divisor"
+            EvalError::ZeroDivisor => "zero_divisor",
+            EvalError::NoRoots => "no_roots"
        }
    }
 }