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 The Go Authors.
* line printer hack by Sean Lake
* modified by Bert Gijsbers
* make pidigits.go #2 use "math/big"
*/
package main
import (
"bufio"
"flag"
"fmt"
"math/big"
"os"
"runtime"
"strconv"
)
var n = 0
var silent = false
var (
tmp1 = big.NewInt(0)
tmp2 = big.NewInt(0)
y2 = big.NewInt(1)
bigk = big.NewInt(0)
accum = big.NewInt(0)
denom = big.NewInt(1)
numer = big.NewInt(1)
ten = big.NewInt(10)
three = big.NewInt(3)
four = big.NewInt(4)
)
func next_term(k int64) int64 {
for {
k++
y2.SetInt64(k*2 + 1)
bigk.SetInt64(k)
tmp1.Lsh(numer, 1)
accum.Add(accum, tmp1)
accum.Mul(accum, y2)
denom.Mul(denom, y2)
numer.Mul(numer, bigk)
if accum.Cmp(numer) > 0 {
return k
}
}
}
func extract_digit(nth *big.Int) int64 {
tmp1.Mul(nth, numer)
tmp2.Add(tmp1, accum)
tmp1.Div(tmp2, denom)
return tmp1.Int64()
}
func next_digit(k int64) (int64, int64) {
for {
k = next_term(k)
d3 := extract_digit(three)
d4 := extract_digit(four)
if d3 == d4 {
return d3, k
}
}
}
func eliminate_digit(d int64) {
tmp1.SetInt64(d)
accum.Sub(accum, tmp1.Mul(denom, tmp1))
accum.Mul(accum, ten)
numer.Mul(numer, ten)
}
func init() {
runtime.GOMAXPROCS(1)
flag.Parse()
if flag.NArg() > 0 {
n, _ = strconv.Atoi(flag.Arg(0))
}
}
func main() {
w := bufio.NewWriter(os.Stdout)
defer w.Flush()
line := make([]byte, 0, 10)
var d, k int64
for i := 1; i <= n; i++ {
d, k = next_digit(k)
line = append(line, byte(d)+'0')
if len(line) == 10 {
if silent != true {
fmt.Fprintf(w, "%s\t:%d\n", string(line), i)
}
line = line[:0]
}
eliminate_digit(d)
}
if len(line) > 0 && silent != true {
fmt.Fprintf(w, "%-10s\t:%d\n", string(line), n)
}
}
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 00:18:44 GMT
MAKE:
/opt/src/go1.23.1/go/bin/go build -o pidigits.go-8.go_run pidigits.go-8.go
7.24s to complete and log all make actions
COMMAND LINE:
./pidigits.go-8.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
9821480865 :110
1328230664 :120
7093844609 :130
5505822317 :140
2535940812 :150
8481117450 :160
2841027019 :170
3852110555 :180
9644622948 :190
9549303819 :200
6442881097 :210
5665933446 :220
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5271201909 :250
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2346034861 :270
0454326648 :280
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6024914127 :300
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6063155881 :320
7488152092 :330
0962829254 :340
0917153643 :350
6789259036 :360
0011330530 :370
5488204665 :380
2138414695 :390
1941511609 :400
4330572703 :410
6575959195 :420
3092186117 :430
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8074462379 :460
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