Floats, bugfixes, small reorganisations

1 files changed, 69 insertions, 0 deletions

diff --git a/nl/mandel.nl b/nl/mandel.nl
new file mode 100644
index 0000000..cef9eb2
--- /dev/null
+++ b/nl/mandel.nl
@@ -0,0 +1,69 @@
+type int = i32;
+type char = i8;
+type string = ptr(char);
+
+extern func void(int) putchar;
+
+void printnum(int n) {
+	if (n < 0) {
+		putchar('-');
+		n = -n;
+	}
+	if (n == 0) {
+		putchar('0');
+		return;
+	}
+	while (n > 0) {
+		putchar('0' + n % 10);
+		n = n / 10;
+	}
+}
+
+int maxiter;
+double lbound;
+double rbound;
+double tbound;
+double bbound;
+double hincr;
+double vincr;
+
+int mandeliter(double x, double y) {
+	double a = x;
+	double b = y;
+	double a2 = a * a;
+	double b2 = b * b;
+	int n = 0;
+	while (n < maxiter && a2 + b2 < 4) {
+		b = 2 * a * b + y;
+		a = a2 - b2 + x;
+		a2 = a * a;
+		b2 = b * b;
+		n = n + 1;
+	}
+	return n;
+}
+
+int main() {
+	maxiter = 32;
+	lbound = -2.0;
+	rbound = 1.0;
+	tbound = 1.5;
+	bbound = -1.5;
+	// hincr = 0.03125;
+	hincr = 0.0625;
+	vincr = 0.0625;
+
+	double y = tbound;
+	while (y >= bbound) {
+		double x = lbound;
+		while (x <= rbound) {
+			int niter = mandeliter(x, y);
+			printnum(niter);
+			putchar(' ');
+			x = x + hincr;
+		}
+		putchar('\n');
+		y = y - vincr;
+	}
+	return 0;
+}