Rename haversine to haversine_01

haversine_01/cpp/haversine.cpp

@@ -0,0 +1,24 @@
+#include "haversine.h"
+#include <math.h>
+
+#define PI 3.14159265358979323845
+#define SQUARE(X) ((X) * (X))
+
+double radians(double degrees);
+
+double haversine_of_degrees(double x0, double y0, double x1, double y1,
+                            double radius) {
+  double dy = radians(y1 - y0);
+  double dx = radians(x1 - x0);
+  y0 = radians(y0);
+  y1 = radians(y1);
+
+  double root_term =
+      SQUARE(sin(dy / 2.0)) + cos(y0) * cos(y1) * SQUARE(sin(dx / 2.0));
+
+  double result = 2.0 * radius * asin(sqrt(root_term));
+
+  return result;
+}
+
+double radians(double degrees) { return (degrees * PI) / 180.0; }