Fix exponential for i128.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/eval.rs b/src/eval.rs
index 4d6ec80..b08bf81 100644
--- a/src/eval.rs
+++ b/src/eval.rs
@@ -22,7 +22,7 @@ impl Num {
         }
     }
 
-    fn powi(self, p: u64) -> Num {
+    fn powi(self, p: i128) -> Num {
         if p == 0 {
             return int(1);
         }
@@ -38,13 +38,13 @@ impl Num {
     pub fn pow(self, other: Num) -> Num {
         match other {
             Num::Int(i) => {
-                if let Ok(u) = u64::try_from(i) {
-                    return self.powi(u);
+                if i >= 0 {
+                    return self.powi(i);
                 }
                 if let Ok(i_32) = i32::try_from(i) {
                     return float(self.as_float().powi(i_32));
                 }
-                float(1.).div(self).powi(-i as u64)
+                float(1.).div(self).powi(-i)
             }
             Num::Float(f) => float(self.as_float().powf(f)),
         }