C Program to Demonstrate #if, #else & #endif preprocessors.

C Program to demonstrate the Preprocessor directives like #if, #else, #define, #endif. C Preprocessors are not the program statements, they are executed before the actual compilation of the code. C Preprocessors substitute the code where they called, i.e they replace the code as they defined. #if, #else are the conditional directives. Here at the compile time #if value is false, so #else part is execute.
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#include<stdio.h>

#define SWITCH 0

/* The #if can only perform
* INTEGER tests!!!!
*/
#if ( SWITCH == 1 )
#define TEXT "Example to #if"
#else
#define TEXT "Example to # else"
#endif

main ()
{
printf(TEXT);
}
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