move exercises and lectures into subfolders

Exercises/C13/AccessingViaPointers/accessing_via_pointers.c

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

Exercises/C13/assigning_pointers.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main (void )
+{
+    // Integer variables
+    int a, ValueB, d;
+
+	// integer pointers
+	int *ptrA=&a, *B=&ValueB, *Data=&d;
+
+	// Float variables
+	float f,y,z;
+
+	// Float pointers
+	float *pf=&f , *q=&y, *Zvalue=&z;
+
+	// We could also do this on separate lines e.g.
+	int SomeData;
+	int *Another;
+	Another = &SomeData;
+
+	return 0;
+}

Exercises/C13/ex2.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main (void )
+{
+	// Declare a in integer
+	int c,d;
+
+	// Declar and integer pointer
+	int *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 %d\n", d);
+
+	// Change the value of c via the pointer ptrC
+	*ptrC = 1;  //c now contains 1
+	printf ("The value in c is %d\n", c);
+
+	return 0;   // exit
+}

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
+}