Fix another error in the solution for Powers of the golden ratio - libzahl - big integer library
HTML git clone git://git.suckless.org/libzahl
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit a5ae82e67f914d9339ac22e0c2df9fe9b79b0f57
DIR parent 89898de3bfa38d39494555a3e109253489a0e0b6
HTML Author: Mattias Andrée <maandree@kth.se>
Date: Mon, 25 Jul 2016 17:03:54 +0200
Fix another error in the solution for Powers of the golden ratio
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat:
M doc/exercises.tex | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
---
DIR diff --git a/doc/exercises.tex b/doc/exercises.tex
@@ -488,7 +488,7 @@ the set of pseudoprimes.
\item \textbf{Powers of the golden ratio}
This was an information gathering exercise.
-For $n \ge 1$, $L_n = [\varphi^n]$, where
+For $n \ge 2$, $L_n = [\varphi^n]$, where
$L_n$ is the $n^\text{th}$ Lucas number.
\( \displaystyle{
@@ -505,12 +505,14 @@ but for efficiency and briefness, we will use
\vspace{-1em}
\begin{alltt}
-void golden_pow(z_t r, z_t p)
+void golden_pow(z_t r, z_t n)
\{
- if (zsignum(p) <= 0)
- zsetu(r, zcmpi(p, -1) >= 0);
+ if (zsignum(n) <= 0)
+ zsetu(r, zcmpi(n, -1) >= 0);
+ else if (!zcmpu(n, 1))
+ zsetu(r, 2);
else
- lucas(r, p);
+ lucas(r, n);
\}
\end{alltt}