What is #elif directive ?

#elif is a preprocessor directive which is used create “if – else if” statements for testing multiple conditions

.

Syntax:

#if condition_1

     statement_1;

     ……………….

     statement_N;

#elif condition_2

     statement_1;

     ………………………….

     statement_N;

…………

………….

#elif condition_N

     statement_1;

     ……………………………

     statement_N;

#endif

Ex:

#if DAY == 1

     #define TODAY “MONDAY”

#elif DAY == 2

     #define TODAY “TUESDAY”

#elif DAY == 3

     #define TODAY “WEDNESDAY”

#elif DAY == 4

     #define TODAY “THURSDAY”

#elif DAY == 5

     #define TODAY “FRIDAY”

#elif DAY == 6

     #define TODAY “SATURDAY”

#elif DAY == 7

     #define TODAY “SUNDAY”

#else

     #define TODAY “INVALID DAY”

#endif