June 2018 Update

Task/Pragmatic-directives/C/pragmatic-directives.c

@@ -0,0 +1,41 @@
+/*Abhishek Ghosh, 7th October 2017*/
+
+/*Almost every C program has the below line,
+the #include preprocessor directive is used to
+instruct the compiler which files to load before compiling the program.
+
+All preprocessor commands begin with #
+*/
+#include<stdio.h>
+
+/*The #define preprocessor directive is often used to create abbreviations for code segments*/
+#define Hi printf("Hi There.");
+
+/*It can be used, or misused, for rather innovative uses*/
+
+#define start int main(){
+#define end return 0;}
+
+start
+
+Hi
+
+/*And here's the nice part, want your compiler to talk to you ?
+Just use the #warning pragma if you are using a C99 compliant compiler
+like GCC*/
+#warning "Don't you have anything better to do ?"
+
+#ifdef __unix__
+#warning "What are you doing still working on Unix ?"
+printf("\nThis is an Unix system.");
+#elif _WIN32
+#warning "You couldn't afford a 64 bit ?"
+printf("\nThis is a 32 bit Windows system.");
+#elif _WIN64
+#warning "You couldn't afford an Apple ?"
+printf("\nThis is a 64 bit Windows system.");
+#endif
+
+end
+
+/*Enlightened ?*/