move exercises and lectures into subfolders

Lectures/LC19/StructureFunction/StructureFunc.c

@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <math.h>
+
+struct Point			/* Define a struture called Point */
+{
+	int x;			/* The X data */
+	int y;			/* The Y data */
+};
+
+struct Line
+{
+    struct Point p1;
+    struct Point p2;
+    float length;
+};
+
+void LineLength( struct Line* line);
+
+int main()
+{
+    struct Line line;
+    line.p1.x = 0;
+    line.p1.y = 0;
+    line.p2.x = 3;
+    line.p2.y = 4;
+
+    LineLength( &line );
+    printf( "Line length = %.3f\n", line.length);
+}
+
+void LineLength( struct Line* line)
+{
+    float dx = line->p2.x - line->p1.x;
+    float dy = line->p2.y - line->p1.y;
+    line->length = sqrt( dx*dx + dy*dy );
+}