Preprocessor Directives This example is called lessons.c. Its purpose is to print in the screen one of two lessons. The output will be either Programming Principles II ######### ####### # # ######## ####### # # # # # # # # # # # # # # # # # # # # ######### # ######## # ######## ####### Or Computer Architecture ######### ####### # ######## ####### # # # # # # # # # # # # # # # # # # # # # ######### # ######## ######## ####### # The whole program is listed below. //----------------------------------------------------------- //This program is for the EPL132 - Laboratory lesson 3 and //aims at showing the usage of IFDEF preprocessor statements // //Author: Kyriakos Stavrou (TSIK) //email : tsik@cs.ucy.ac.cy //Uncomment this line for EPL132 and comment the next one #define EPL321 //#define EPL132 int main() { #ifdef EPL132 printf(" \n \n"); printf(" Programming Principles II \n\n"); printf(" ######### ####### # # ...