move exercises and lectures into subfolders

Lectures/LC14/LineLength/LineLength.c

@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+float LineLength(float x1, float x2, float y1, float y2);
+
+int main()
+{
+    float p1x = 3.4, p2x = 5.7, p1y = 0.0, p2y = 6.8;
+    float length = 0;
+    length = LineLength(p1x, p2x, p1y, p2y);
+    printf("Length = %f", length);
+    return 0;
+}
+
+float LineLength(float x1, float x2, float y1, float y2)
+{
+    float result;
+    float dx = x2-x1;
+    float dy = y2-y1;
+    float tol = 1e-10;
+    if (fabs(dx) < tol && fabs(dy) < tol )
+        return -1;
+    result = sqrt(dx*dx + dy*dy);
+    return result;
+}

Lectures/LC14/PointerFunc1/pointer_function_example_1.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+// As we are using the function BEFORE it is actually written we need to provide the
+// prototype so that the compiler can verify we are calling it correctly
+
+void CalculateArea ( double Radius, double *pArea);  // note the ‘*’
+
+// This is the main code for our application
+
+int main()
+{
+    double radius, area;
+    radius = 1.0;    
+    CalculateArea (radius, &area);    
+	
+	printf ("The area of circle of radius %f is %f\n", radius, area);
+    return 0;
+    
+}
+
+
+// And here is our function
+
+// Note: Pi is written out simply to match the notes, M_PI could also be used
+
+void CalculateArea ( double Radius, double *pArea )
+{
+    *pArea = 3.14159265 * Radius * Radius;
+    return;
+}

Lectures/LC14/PointerFunc2/pointer_function_example_2.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+// As we are using the function BEFORE it is actually written we need to provide the
+// prototype so that the compiler can verify we are calling it correctly
+
+void CalculateVolumeAndSA ( double Radius, double Length, double *Volume, double *SurfaceArea);  // note the <20>*<2A>
+
+// This is the main code for our application
+
+int main()
+{
+    double radius = 3.4, length = 7.3, volume, SurfaceArea;
+
+    CalculateVolumeAndSA(radius, length, &volume, &SurfaceArea);
+
+	printf("The volume is %f \n", volume);
+	printf( "The surface area is %f\n", SurfaceArea);
+    return 0;
+
+}
+
+
+// And here is our function
+
+void CalculateVolumeAndSA ( double Radius, double Length, double *Volume, double *SurfaceArea)  // note the <20>*<2A>
+{
+    *Volume = M_PI * Radius * Radius * Length;
+    *SurfaceArea = ( 2 * M_PI * Radius * Radius * Length ) +( 2 * M_PI * Radius * Length );
+}