Initial commit of lecture code

LC19/enumdefine.c

@@ -0,0 +1,41 @@
+/* This program shows the use of an 'enum' statements to make code
+   more general. This is an 'OK' method but realise that it does
+   mean that we need to recompile if we change a vlaue.
+   
+   This method is best used only for fixed constants (eg PI )   
+
+   While this version acts the same as the previous, it is better
+   as the compiler handles the 'enum'. Whereas the pre-processor
+   deals with #defines (performing simple substitutions) this is done 
+   no with little error checking, the 'enum' is dealt with by the 
+   compiler which finds error more easily - hence more stable code.
+
+*/
+   
+#include <stdio.h>
+#include <stdlib.h>
+
+enum ProblemSize { SIZE = 3 };          /* 'ProblemSize' is optional
+                                        but a warning is generated is 
+                                        it not specified */
+
+
+int main(void)
+{      
+   int i,j;
+   int iMatrix[SIZE][SIZE];
+   int iCols = SIZE;
+   int iRows = SIZE;
+   
+   for (i = 0 ; i < iCols ; i++ )
+   {
+     for (j = 0 ; j < iRows ; j++ )
+     {
+       iMatrix[i][j] = i+j;
+       printf ("%2d ",iMatrix[i][j]);
+     }
+     printf ("\n");
+   }
+       
+   return 0; 
+}