poly_perim.c

1 files changed, 25 insertions, 0 deletions

diff --git a/poly_perim.c b/poly_perim.c
new file mode 100644
index 0000000..8f1528f
--- /dev/null
+++ b/poly_perim.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <math.h>
+
+double poly_perim(unsigned ndims, double *xcoords, double *ycoords)
+{
+	double retval = 0;
+
+	for (unsigned i = 0; i < ndims; i++) {
+		double left = xcoords[(i + 1) % ndims] - xcoords[i];
+		double right = ycoords[(i + 1) % ndims] - ycoords[i];
+
+		retval += sqrt(left * left + right * right);
+	}
+
+	return retval;
+}
+
+int main(void)
+{
+	printf("Perimiter: %f\n", poly_perim(3,
+					     (double []){1, 1, 4},
+					     (double []){2, 5, 5}));
+
+	return 0;
+}