A **directive** specifies how a compiler should process the input. The `elif` preprocessor directive in C is equivalent to an `else if` statement -- it provides an alternate path of action when used with `#if`, `#ifdef`, or `#ifndef` directives. <br>
Execution enters the `#elif` block when the `#if` condition is false and the `elif` condition holds true (this is shown below).



# Syntax
```c
#elif conditional_expression
```

> The `#elif` directive must be succeeded by the `#endif` directive.
# Code




#include <stdio.h>

#define checker 5

int main()
{
   #if checker <= 3
   printf("This is the if directive block.\n");

   #elif checker > 3
   printf("This is the elif directive block.\n");
   #endif

   return 0;
}

What is the #elif directive in C?

Provides an alternative action path in C preprocessor directives when initial condition fails.