String outputFile = "fibonacci.dat";
if (args.length > 0) outputFile = args[0];
int howMany;
try {
howMany = Integer.parseInt(args[1]);
}
catch (Exception e) {
howMany = 20;
}
try {
// so that the buffer doesn't have to be resized
// we calculate in advance the size of the necessary byte array
ByteArrayOutputStream bout = new ByteArrayOutputStream(howMany*4);
DataOutputStream dout = new DataOutputStream(bout);
// first two Fibonacci numbers must be given
// to start the process
int f1 = 1;
int f2 = 1;
dout.writeInt(f1);
dout.writeInt(f2);
// now calculate the rest
for (int i = 2; i < howMany; i++) {
int temp = f2;
f2 = f2 + f1;
f1 = temp;
dout.writeInt(f2);
}
FileOutputStream fout = new FileOutputStream(outputFile);
fout.write(bout.toByteArray());
fout.flush();
fout.close();
}
catch (IOException e) {
System.err.println(e);
}
