mandelbrot Java #8 program
source code
/* The Computer Language Benchmarks Game
https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
line-by-line from Greg Buchholz's C program
*/
class mandelbrot {
public static void main(String[] args) {
int w, h, bit_num = 0;
int byte_acc = 0;
int i, iter = 50;
double x, y, limit = 2.0;
double Zr, Zi, Cr, Ci, Tr, Ti;
w = h = Integer.parseInt(args[0]);
System.out.println("P4\n"+ w + " " + h);
for(y=0;y<h;y++)
{
for(x=0;x<w;x++)
{
Zr = Zi = Tr = Ti = 0.0;
Cr = (2.0*(double)x/w - 1.5); Ci=(2.0*(double)y/h - 1.0);
for (i=0;i<iter && (Tr+Ti <= limit*limit);++i)
{
Zi = 2.0*Zr*Zi + Ci;
Zr = Tr - Ti + Cr;
Tr = Zr * Zr;
Ti = Zi * Zi;
}
byte_acc <<= 1;
if(Tr+Ti <= limit*limit) byte_acc |= 0x01;
++bit_num;
if(bit_num == 8)
{
System.out.write(byte_acc);
byte_acc = 0;
bit_num = 0;
}
else if(x == w-1)
{
byte_acc = byte_acc << (8-w%8);
System.out.write(byte_acc);
byte_acc = 0;
bit_num = 0;
}
}
}
System.out.flush();
}
}
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,
mixed mode, sharing)
Mon, 04 Nov 2024 21:53:41 GMT
MAKE:
mv mandelbrot.java-8.java mandelbrot.java
/opt/src/jdk-23/bin/javac -d . -cp . mandelbrot.java
2.72s to complete and log all make actions
COMMAND LINE:
/opt/src/jdk-23/bin/java -cp . mandelbrot 16000
(BINARY) PROGRAM OUTPUT NOT SHOWN