move exercises, lecture examples, labs into subfolders

Exercises/C13/ex3.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main (void )
+{
+	// Declare a in integer
+	float c,d;
+
+	// Declar and integer pointer
+	float *ptrC;
+
+	// Some assgnments
+	c = 10; // C now contains the value 10
+	ptrC = &c;   // ptrC now 'Points' to c
+
+	*ptrC = 20;
+
+	// Get the value of c via the pointer and store in d
+	d = *ptrC;  // d now contains 10
+	printf ("The value in d is %f\n", d);
+
+	// Change the value of c via the pointer ptrC
+	*ptrC = 1;  //c now contains 1
+	printf ("The value in c is %f\n", c);
+
+	return 0;   // exit
+}