source code
/* The Computer Language Benchmarks Game
https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
contributed by Isaac Gouy
*/
import java.math.BigInteger;
public class pidigits {
static final int L = 10;
public static void main(String args[]) {
int n = Integer.parseInt(args[0]);
int j = 0;
PiDigitSpigot digits = new PiDigitSpigot();
while (n > 0){
if (n >= L){
for (int i=0; i<L; i++) System.out.print( digits.next() );
j += L;
} else {
for (int i=0; i<n; i++) System.out.print( digits.next() );
for (int i=n; i<L; i++) System.out.print(" ");
j += n;
}
System.out.print("\t:"); System.out.println(j);
n -= L;
}
}
}
class PiDigitSpigot {
Transformation z, x, inverse;
public PiDigitSpigot(){
z = new Transformation(1,0,0,1);
x = new Transformation(0,0,0,0);
inverse = new Transformation(0,0,0,0);
}
public int next(){
int y = digit();
if (isSafe(y)){
z = produce(y); return y;
} else {
z = consume( x.next() ); return next();
}
}
public int digit(){
return z.extract(3);
}
public boolean isSafe(int digit){
return digit == z.extract(4);
}
public Transformation produce(int i){
return ( inverse.qrst(10,-10*i,0,1) ).compose(z);
}
public Transformation consume(Transformation a){
return z.compose(a);
}
}
class Transformation {
BigInteger q, r, s, t;
int k;
public Transformation(int q, int r, int s, int t){
this.q = BigInteger.valueOf(q);
this.r = BigInteger.valueOf(r);
this.s = BigInteger.valueOf(s);
this.t = BigInteger.valueOf(t);
k = 0;
}
public Transformation(BigInteger q, BigInteger r, BigInteger s, BigInteger t){
this.q = q;
this.r = r;
this.s = s;
this.t = t;
k = 0;
}
public Transformation next(){
k++;
q = BigInteger.valueOf(k);
r = BigInteger.valueOf(4 * k + 2);
s = BigInteger.valueOf(0);
t = BigInteger.valueOf(2 * k + 1);
return this;
}
public int extract(int j){
BigInteger bigj = BigInteger.valueOf(j);
BigInteger numerator = (q.multiply(bigj)).add(r);
BigInteger denominator = (s.multiply(bigj)).add(t);
return ( numerator.divide(denominator) ).intValue();
}
public Transformation qrst(int q, int r, int s, int t){
this.q = BigInteger.valueOf(q);
this.r = BigInteger.valueOf(r);
this.s = BigInteger.valueOf(s);
this.t = BigInteger.valueOf(t);
k = 0;
return this;
}
public Transformation compose(Transformation a){
return new Transformation(
q.multiply(a.q)
,(q.multiply(a.r)).add( (r.multiply(a.t)) )
,(s.multiply(a.q)).add( (t.multiply(a.s)) )
,(s.multiply(a.r)).add( (t.multiply(a.t)) )
);
}
}
notes, command-line, and program output
NOTES:
64-bit Ubuntu quad core
java 23 2024-09-17
Java HotSpot(TM) 64-Bit Server VM
(build 23+37-2369,
interpreted mode, sharing)
Fri, 20 Sep 2024 05:18:24 GMT
MAKE:
mv pidigits.javaxint pidigits.java
/opt/src/jdk-23/bin/javac -d . -cp . pidigits.java
1.52s to complete and log all make actions
COMMAND LINE:
/opt/src/jdk-23/bin/java -Xint -Djava.library.path=Include/java -cp . pidigits 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
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3852110555 :180
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