move exercises and lectures into subfolders

Lectures/LC16/Dynamic1/Dynamic1.c

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+/* An example of
+
+	Creating dynamically an array
+	Populating the array
+	Displaying the contents
+	Freeing up the memory
+
+	Example 1 : No sucessful allocation checking 
+
+
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+int main(void)
+{
+   int *ipArray = NULL;         /* Create the pointer and set   */
+	 /* to null to start with        */
+   int iSize = 0;               /* Define our 'size' variable   */
+
+   int i;                       /* A Loop variables             */
+
+   /* Prompt for array size */
+
+   printf("\nHow big is the array to be ? ");
+   scanf("%d",&iSize);
+
+   /* Allocate the memory */
+   ipArray = (int *)calloc(iSize, sizeof(int));
+
+   /* Populate the array (Method 1) */
+   for ( i = 0 ; i < iSize ; i++ )
+     ipArray[i] = iSize - i;
+
+   /* display the data */
+   for ( i = 0 ; i < iSize ; i++ )
+     printf("Value %d is %d\n",i,ipArray[i] );
+
+   /* free memory */
+   free(ipArray);
+
+   return 0;
+}
+

Lectures/LC16/Dynamic2/Dynamic2.c

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+/* An example of
+
+	Creating dynamically an array
+	Populating the array
+	Displaying the contents
+	Freeing up the memory
+
+	Version 2 : Check memory has been assigned
+				
+
+	
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+int main(void)
+{
+   int *ipArray = NULL;		/* Create the pointer and set   */
+				/* to null to start with 	*/
+   int iSize = 0;		/* Define our 'size' variable 	*/
+
+   int i;			/* A Loop variables 	        */
+
+   /* Prompt for array size */
+
+   printf("\nHow big is the array to be ? ");
+   scanf("%d",&iSize);
+
+   /* Allocate the memory */
+   ipArray = (int *)calloc(iSize, sizeof(int));
+
+   if ( ipArray == NULL )
+   {
+      printf("\nUnable to allocate the memory requested");
+      printf("\n  ** Program terminating ** \n");
+      exit (1);
+   }
+
+   /* Populate the array (Method 1) */
+   for ( i = 0 ; i < iSize ; i++ )
+     ipArray[i] = iSize - i;
+
+   /* display the data */
+   for ( i = 0 ; i < iSize ; i++ )
+     printf("Value %d is %d\n",i,ipArray[i] );
+
+   /* free memory */
+   free(ipArray);
+
+   return 0;
+}
+

Lectures/LC16/Dynamic3/Dynamic3.c

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+/* An example of
+
+	Creating dynamically an array
+	Populating the array
+	Displaying the contents
+	Freeing up the memory
+
+	Version 3 : Read and Write values using pointers
+
+
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+int main(void)
+{
+   int *ipArray = NULL;         /* Create the pointer and set   */
+				/* to null to start with        */
+
+   int *ipStartValue = NULL;    /* A place to store ipArray's   */
+				/* initial value ,ie ipArray[0] */
+   int iSize = 0;               /* Define our 'size' variable   */
+
+   int i;                       /* A Loop variables             */
+
+   /* Prompt for array size */
+
+   printf("\nHow big is the array to be ? ");
+   scanf("%d",&iSize);
+
+   /* Allocate the memory */
+   ipArray = (int *)calloc(iSize, sizeof(int));
+
+   if ( ipArray == NULL )
+   {
+      printf("\nUnable to allocate the memory requested");
+      printf("\n  ** Program terminating ** \n");
+      exit (1);
+   }
+
+   /* Store the base memory address for use later */
+   ipStartValue = ipArray;
+
+   /* Populate the array (Method 2 - Use Pointers: This is much faster !) */
+   for ( i = 0 ; i < iSize ; i++ )
+     *ipArray++ = iSize - i;
+     
+
+   /* Reset the pointer to the origin of the array */
+   ipArray = ipStartValue;
+
+   /* display the data */
+   for ( i = 0 ; i < iSize ; i++ )
+     printf("Value %d is %d\n",i,*ipArray++ );
+
+   /* free memory : Again, reset ipArray to its origin */
+
+   ipArray = ipStartValue;
+   free(ipArray);
+
+   /* The above two lines could be replaced with    free (ipStartValue)   */
+
+   return 0;
+}
+