pidigits C++ g++ #4 program
source code
/* The Computer Language Benchmarks Game
* https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
*
* contributed by Alessandro Power
*/
#include <gmpxx.h>
#include <cstdlib>
#include <iostream>
class LFT {
public:
mpz_class q;
mpz_class r;
mpz_class t;
unsigned k;
public:
LFT() : q(1), r(0), t(1), k(0){};
void next() {
++k;
r = (2 * k + 1) * (2 * q + r);
t = (2 * k + 1) * t;
q = q * k;
}
unsigned extract(unsigned x) const {
static mpz_class tmp0, tmp1;
tmp0 = q * x + r;
tmp1 = tmp0 / t;
return tmp1.get_ui();
}
void produce(unsigned n) {
q = 10 * q;
r = 10 * (r - n * t);
}
};
int main(int, char** argv) {
std::ios_base::sync_with_stdio(false);
const std::size_t TOTAL_DIGITS = std::atol(argv[1]);
LFT lft;
std::size_t n_digits = 0;
while (n_digits < TOTAL_DIGITS) {
std::size_t i = 0;
while (i < 10 and n_digits < TOTAL_DIGITS) {
lft.next();
if (lft.q > lft.r) continue;
auto digit = lft.extract(3);
if (digit == lft.extract(4)) {
std::cout << digit;
lft.produce(digit);
++i;
++n_digits;
}
}
// Pad digits with extra spaces if TOTAL_DIGITS was not a
// multiple of 10.
for (; i < 10; ++i) std::cout << ' ';
std::cout << "\t:" << n_digits << '\n';
}
}
notes, command-line, and program output
NOTES:
64-bit Ubuntu quad core
g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0
Tue, 22 Oct 2024 20:28:55 GMT
MAKE:
/usr/bin/g++ -c -pipe -O3 -fomit-frame-pointer -march=ivybridge -std=c++14 -g pidigits.gpp-4.c++ -o pidigits.gpp-4.c++.o && \
/usr/bin/g++ pidigits.gpp-4.c++.o -o pidigits.gpp-4.gpp_run -lgmp -lgmpxx
rm pidigits.gpp-4.c++
3.91s to complete and log all make actions
COMMAND LINE:
./pidigits.gpp-4.gpp_run 10000
(TRUNCATED) PROGRAM OUTPUT:
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