Initial data commit

Task/Executable-library/Limbo/executable-library-2.limbo

@@ -0,0 +1,45 @@
+implement ExecsExeclib;
+
+include "sys.m"; sys: Sys;
+include "draw.m";
+
+ExecsExeclib: module {
+	init: fn(ctxt: ref Draw->Context, args: list of string);
+};
+
+# Usually, this would be placed into something like "execlib.m",
+# but it's fine here.
+Execlib: module {
+	hailstone: fn(i: big): list of big;
+};
+
+init(nil: ref Draw->Context, nil: list of string)
+{
+	sys = load Sys Sys->PATH;
+	# This program expects that the result of compiling Execlib is execlib.dis,
+	# so you'll need to adjust this line if you used a different filename.
+	lib := load Execlib "execlib.dis";
+	if(lib == nil)
+		die("Couldn't load execlib.dis");
+
+	counts := array[352] of { * => 0 };
+	for(i := 1; i < 100000; i++) {
+		counts[len lib->hailstone(big i)]++;
+	}
+
+	max := 0;
+	maxi := 0;
+	for(i = 1; i < len counts; i++) {
+		if(counts[i] > max) {
+			max = counts[i];
+			maxi = i;
+		}
+	}
+	sys->print("The most common sequence length is %d (encountered %d times)\n", maxi, max);
+}
+
+die(s: string)
+{
+	sys->fprint(sys->fildes(2), "runls: %s: %r", s);
+	raise "fail:errors";
+}