Initial commit of lecture code

LC18/filemove.c

@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+/* Example 3 - jumping & getting element count */
+
+int main(void)
+{
+
+	 int ValRead;
+	 int Item;
+	 int Locn;
+	 FILE *fptr;
+	 /* Open the file from example 1 */
+
+	 fptr = fopen ("data.dat","rb");
+	 if ( fptr == NULL )                                             
+	 {
+	   printf ("\nError opening input file - aborting ");
+	   exit (0);
+	 }
+	 
+	 /* Ask the user which value to jump to */
+	 printf ("\nWhich value do you wish to view ? ");
+	 scanf ("%d",&Item);
+	 
+	 /* Jump to this item                    */
+	 /* notice we move in steps of item size */    
+	 
+	 Locn = Item * sizeof(int);
+	 fseek (fptr, Locn, SEEK_SET);
+	 
+	 /* And read a single integer in */
+	 fread (&ValRead, sizeof(int), 1, fptr );
+	 
+	 /* Display the read value */
+	 printf ("Item %d is %d\n",Item,ValRead);
+								   
+	 /* And close */
+	 fclose (fptr); 
+	 
+	 /* All Done */
+	return 0;
+	
+}
+ 

LC18/filesize.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+/* Example 3 - jumping & getting element count */
+
+main()
+{
+
+ long FileBytes;
+ FILE *fptr;
+ /* Open the file from example 1 */
+
+ fptr = fopen ("data.dat","rb");
+ if ( fptr == NULL )                                             
+ {
+   printf ("\nError opening input file - aborting ");
+   exit (0);
+ }
+                         
+ /* Move to the end of file */
+ fseek (fptr, 0, SEEK_END);
+                              
+ /* Get the byte size */
+ FileBytes = ftell(fptr);
+ 
+ /* Convert to size based on fact all int's */
+ FileBytes = FileBytes / sizeof(int);
+ 
+ /* Display the read value */
+ printf ("No. of items in file is %d\n",FileBytes);
+                               
+ /* And close */
+ fclose (fptr); 
+ 
+ /* All Done */
+ return 0;
+}
+