Initial commit of lecture code

LC19/ConstHashDefine.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+//macro definition
+#define X 30
+
+//global integer constant
+const int Y = 10;
+
+int main()
+{
+	//local integer constant`
+	const  int Z = 20;
+
+	printf("Value of X: %d\n", X);
+	printf("Value of Y: %d\n", Y);
+	printf("Value of Z: %d\n", Z);
+
+//	#undef X
+//	#define X 300
+//	printf("Value of X: %d\n", X);
+
+//  Y = 30;
+
+	return 0;
+}