libzahl

big integer library
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commit a5ae82e67f914d9339ac22e0c2df9fe9b79b0f57
parent 89898de3bfa38d39494555a3e109253489a0e0b6
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:
doc/exercises.tex | 12+++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

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}