From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001
From: Duncan Wilkie <antigravityd@gmail.com>
Date: Sat, 18 Nov 2023 06:11:09 -0600
Subject: Initial commit.

---
 ic-reals-6.3/tests/iter.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 ic-reals-6.3/tests/iter.c

(limited to 'ic-reals-6.3/tests/iter.c')

diff --git a/ic-reals-6.3/tests/iter.c b/ic-reals-6.3/tests/iter.c
new file mode 100644
index 0000000..2c4d295
--- /dev/null
+++ b/ic-reals-6.3/tests/iter.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include "real.h"
+#include "real-impl.h"
+#include <math.h>
+
+/*
+ * Reinhold's iter example from the user manual.
+ */
+Real eps, eps2;
+Real delay(Real (*)(Real), Real);
+
+main(int argc, char *argv[])
+{
+	Real x, y, z;
+	double f;
+	Real makeRealSignCNQInt(Sign, char *, int, int, int);
+	Real iter(Real);
+
+	MyName = argv[0];
+
+	if (argc != 7) {
+		fprintf(stderr, "%s <sign> <c> <n> <a> <b> <ndigits>\n", MyName);
+		exit(1);
+	}
+
+	initReals();
+
+	debugTrace(1);
+
+	y = makeRealSignCNQInt(
+				atoi(argv[1]),	/* sign */
+				argv[2],		/* c */
+				atoi(argv[3]), 	/* n */
+				atoi(argv[4]),	/* a */
+				atoi(argv[5]));	/* b */
+
+	print_R_Dec(y, atoi(argv[6]));
+	printf("\n");
+
+	eps = vector_Int(1, 100000000);
+	eps2 = vector_Int(1, 200000000);
+
+	x = iter(y);
+	print_R_Dec(x, atoi(argv[6]));
+	printf("\n");
+}
+
+Real
+iter(Real x)
+{
+	Real y, d;
+	static int doneInit = 0;
+	void delayCls();
+
+	y = div_R_Int(x, 2);
+	d = abs_R(sub_R_R(x, y));
+	return realIf(2,
+		lt_R_R(d, eps), y,
+		gt_R_R(d, eps2), realDelay((Delay_Fun) iter, (Delay_Arg) y));
+}
-- 
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