move exercises, lecture examples, labs into subfolders

Lectures/LC20/AreaFunc.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <math.h>
+
+
+float CalculateAreaOfCircle ( float radius )
+{
+	float area;
+	area = M_PI * radius * radius ;
+	return (area) ;
+}
+
+float CalculateSurfaceAreaOfCylinder ( float radius, float length )
+{
+	float area;
+	area = 2.0 * ( M_PI * radius * radius ) + ( M_PI * 2.0 * radius * length );       // two ends + side
+	return (area) ;
+}