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-rw-r--r--doc/exercises.tex2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/exercises.tex b/doc/exercises.tex
index e89c2b3..93f77e4 100644
--- a/doc/exercises.tex
+++ b/doc/exercises.tex
@@ -508,7 +508,7 @@ but for efficiency and briefness, we will use
void golden_pow(z_t r, z_t p)
\{
if (zsignum(p) <= 0)
- zsetu(r, zzero(p));
+ zsetu(r, zcmpi(p, -1) >= 0);
else
lucas(r, p);
\}