fix calulation of x^q, where 1/q is a negative integer

2 files changed, 3 insertions, 0 deletions

diff --git a/src/mp.c b/src/mp.c
index 30f69f4..7b224c6 100644
--- a/src/mp.c
+++ b/src/mp.c
@@ -435,6 +435,8 @@ mp_root(const MPNumber *x, int64_t n, MPNumber *z)
 
     if (n < 0)
     {
+        mpc_ui_div(z->num, 1, x->num, MPC_RNDNN);
+
         if (n == INT64_MIN)
             p = (uint64_t) INT64_MAX + 1;
         else
diff --git a/src/test-mp-equation.c b/src/test-mp-equation.c
index adf6c06..3e1d993 100644
--- a/src/test-mp-equation.c
+++ b/src/test-mp-equation.c
@@ -476,6 +476,7 @@ test_equations(void)
     test("2^0.5", "1.414213562", 0);
     test("₃√−8", "−2", 0);
     test("(−8)^(1÷3)", "−2", 0);
+    test("e^-2^-5", "0.969233234", 0);
 
     test("0 mod 7", "0", 0);
     test("6 mod 7", "6", 0);