source code
/* The Computer Language Benchmarks Game
* https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
*
* based on pidigits.c (by Paolo Bonzini & Sean Bartlett,
* modified by Michael Mellor)
*
* contributed by Zhao Zhiqiang.
*/
package main
/*
#cgo LDFLAGS: -lgmp
#include <gmp.h>
#include <stdlib.h>
*/
import "C"
import (
"bufio"
"flag"
"fmt"
"os"
"runtime"
"strconv"
)
var n = 0
func extract_digit(nth uint32) uint32 {
C.mpz_mul_ui(&tmp1[0], &num[0], C.ulong(nth))
C.mpz_add (&tmp2[0], &tmp1[0], &acc[0])
C.mpz_tdiv_q(&tmp1[0], &tmp2[0], &den[0])
return uint32(C.mpz_get_ui(&tmp1[0]))
}
func eliminate_digit(d uint32) {
C.mpz_submul_ui(&acc[0], &den[0], C.ulong(d))
C.mpz_mul_ui(&acc[0], &acc[0], 10)
C.mpz_mul_ui(&num[0], &num[0], 10)
}
func next_term(k uint32) {
k2 := C.ulong(k*2+1)
C.mpz_addmul_ui(&acc[0], &num[0], 2)
C.mpz_mul_ui(&acc[0], &acc[0], k2)
C.mpz_mul_ui(&den[0], &den[0], k2)
C.mpz_mul_ui(&num[0], &num[0], C.ulong(k))
}
func init() {
runtime.GOMAXPROCS(1)
flag.Parse()
if flag.NArg() > 0 {
n, _ = strconv.Atoi(flag.Arg(0))
}
}
var tmp1, tmp2, acc, den, num C.mpz_t
func main() {
w := bufio.NewWriter(os.Stdout)
defer w.Flush()
C.mpz_init(&tmp1[0])
C.mpz_init(&tmp2[0])
C.mpz_init_set_ui(&acc[0], 0)
C.mpz_init_set_ui(&den[0], 1)
C.mpz_init_set_ui(&num[0], 1)
k := uint32(0)
d := uint32(0)
for i := 0; i < n; {
k++
next_term(k)
if C.mpz_cmp(&num[0], &acc[0]) > 0 {
continue
}
d = extract_digit(3)
if d != extract_digit(4) {
continue
}
fmt.Printf("%d", d)
i++
if i % 10 == 0 {
fmt.Printf("\t:%d\n", i)
}
eliminate_digit(d)
}
}
notes, command-line, and program output
NOTES:
64-bit Ubuntu quad core
go version go1.23.1 linux/amd64
GOAMD64=v2
Fri, 06 Sep 2024 00:18:25 GMT
MAKE:
/opt/src/go1.23.1/go/bin/go build -o pidigits.go-3.go_run pidigits.go-3.go
10.85s to complete and log all make actions
COMMAND LINE:
./pidigits.go-3.go_run 10000
(TRUNCATED) PROGRAM OUTPUT:
3141592653 :10
5897932384 :20
6264338327 :30
9502884197 :40
1693993751 :50
0582097494 :60
4592307816 :70
4062862089 :80
9862803482 :90
5342117067 :100
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1328230664 :120
7093844609 :130
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3852110555 :180
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