change 0.5 to 1/2

Author: bollu

src/Symengine.hs

@@ -212,7 +212,7 @@ instance Floating BasicSym where
     pi = Symengine.pi
     exp x = e ** x
     log = undefined
-    sqrt x = x  ** 0.5
+    sqrt x = x  ** 1/2
     (**) = basic_pow
     logBase = undefined
     sin = basic_unaryop basic_sin_ffi

test/Spec.hs

@@ -42,9 +42,9 @@ unitTests = testGroup "Unit tests"
       cos zero @?= one
 
       sin (pi / 6) @?= 1 / 2
-      sin (pi / 3) @?= 3 ** 0.5 / 2
+      sin (pi / 3) @?= (3 ** (1/2)) / 2
 
-      cos (pi / 6) @?= 3 ** 0.5 / 2
+      cos (pi / 6) @?= (3 ** (1/2)) / 2
       cos (pi / 3) @?= 1 / 2 
 
       sin pi_over_2 @?= one