move exercises and lectures into subfolders

Lectures/LC19/FileHeaderMove/file_header_move.c

@@ -0,0 +1,99 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct MyStruct
+{
+        int NoItems;
+		int max;
+        float average;
+};
+
+int main()
+{
+
+ struct MyStruct MyRecord;
+ FILE *fptr;
+
+ int ArrayData[100];
+ int items = 0;
+ int sum = 0;
+ int i;
+ int AValue;
+
+
+
+ /* Write this file to disk - binary format, usual error checking */
+ fptr = fopen ("strdata.dat","wb");
+ if ( fptr == NULL )
+ {
+   printf ("\nError creating file - aborting ");
+   exit (0);
+ }
+
+ /* Pop some dummy data into our structure */
+ MyRecord.NoItems = 0;
+ MyRecord.max = 0; ;
+ MyRecord.average = 0;
+
+ /* This line does the writing of the structure */
+ fwrite ( &MyRecord, sizeof(struct MyStruct), 1, fptr);
+
+ /* Populate the array */
+ for ( i = 0 ; i < 100 ; i++)
+ {
+	 ArrayData[i] = i;
+	 if ( ArrayData [i] > MyRecord.max)
+		 MyRecord.max = ArrayData[i];
+	 sum = sum + ArrayData[i];
+	 items++;
+ }
+
+
+ /* This line does the writing of the Array */
+ fwrite ( &ArrayData[0],  sizeof(int),100, fptr);
+
+ /* Update the values in the structure */
+ MyRecord.NoItems = items;
+ MyRecord.average= (float)sum / (float)items;
+
+ /* rewind the file to write the structure again */
+ fseek(fptr, SEEK_SET, 0);
+ rewind (fptr);
+
+ /* This line does the writing of the structure */
+ fwrite ( &MyRecord, sizeof(struct MyStruct), 1, fptr);
+
+ /* And close */
+ fclose (fptr);
+
+/* To read the data we would use */
+
+ fptr = fopen ("strdata.dat","rb");
+ if ( fptr == NULL )
+ {
+   printf ("\nError opening input file - aborting ");
+   exit (0);
+ }
+
+ /* This line does the reading */
+ fread ( &MyRecord, sizeof(struct MyStruct), 1, fptr);
+ printf ("No. items in the file = %d\n", MyRecord.NoItems);
+ printf ("Maximum = %d\n", MyRecord.max);
+ printf ("Average is = %.2f\n", MyRecord.average);
+
+ // Get how far to move for thr 10th item
+ long Posn = sizeof (struct MyStruct) + (9 * sizeof(int));
+
+ // Move
+ fseek(fptr, Posn, SEEK_SET);
+
+ // Read value
+ fread ( &AValue, sizeof(int),1 , fptr);
+ printf ("The 10th value is %d", AValue);
+
+ /* And close */
+ fclose (fptr);
+
+ /* All Done */
+ return 0;
+}