# pidigits Java program

## 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);
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)
);
}
}

```

## notes, command-line, and program output

```NOTES:
java 22 2024-03-19
Java HotSpot(TM) 64-Bit Server VM
(build 22+36-2370,
mixed mode, sharing)

Sat, 25 May 2024 21:14:13 GMT

MAKE:
mv pidigits.java pidigits.java
mv: 'pidigits.java' and 'pidigits.java' are the same file
make: [/home/dunham/all-benchmarksgame/2000-benchmarksgame/nanobench/makefiles/u64q.programs.Makefile:279: pidigits.java_run] Error 1 (ignored)
/opt/src/jdk-22/bin/javac -d . -cp . pidigits.java

1.66s to complete and log all make actions

COMMAND LINE:
/opt/src/jdk-22/bin/java -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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7093844609	:130
5505822317	:140
2535940812	:150
8481117450	:160
2841027019	:170
3852110555	:180
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5271201909	:250
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