The **`nexttowardl()`** function produces the smallest possible value after a number in a given direction. The declaration of `nexttowardl()` is shown below:
```C
long double nexttowardl (long double num, long double dir);
```
# Parameters
* `num`: The base number
* `dir`: The direction of the floating point with respect to `num`
# Return value
The `nexttowardl()` function returns the next representable `long double` after `num` in the direction of `dir`.

# Library
To use the `nexttowardl()` function, include the following library:
```C
#include <math.h>
```

# Example
Consider the code snippet below, which demonstrates the implementation of `nexttowardl()`:

#include <stdio.h>
#include <math.h>

int main() {

  long double a = 0.0;
  long double b = 2.0;
  long double c = -2.0;

  long double x = nexttowardl(a, b);
  long double y = nexttowardl(a, c);

  printf("nexttowardl ( %Lf, %Lf ) = ( %Le) \n", a, b, x);
  printf("nexttowardl ( %Lf, %Lf ) = ( %Le) \n", a, c, y);
  
  return 0;
}

gcc compiler

# Explanation
The `nexttowardl()` function is used in lines 10 and 11 to compute the next representable floating-point number after `a` in the direction of `b` and `c`.

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What is nexttowardl() in C?

The nexttowardl() function returns the next representable long double after num towards the direction dir.