**`scalblnl`** in C is used to multiply a `long double` value by `FLT_RADIX` raised to a user-specified value. `scalblnl` is defined in the `math.h` header file and the function declaration is as follows:
```C
long double scalblnl(long double arg, long exp);
```
>`FLT_RADIX` is an integer constant defined in `<float.h>`. Its value is `2` for most binary systems. 


# Parameters
`arg`: `long double` value

`exp`: `long` value

# Return value
* No errors: $arg*FLT\_RADIX^{exp}$

* Range error due to underflow: Correct result after rounding

* Range error due to overflow: ±HUGE_VAL, ±HUGE_VALF, or ±HUGE_VALL

# Error handling
Errors are recorded according to the macro constant [math_errhandling](https://en.cppreference.com/w/c/numeric/math/math_errhandling). Some special cases are handled as follows:
* If `arg` is $±0$, then unmodified `arg` is returned
* If `arg` is ±$\infty$, then unmodified `arg` is returned
* If `exp` is $0$, then unmodified `arg` is returned
* If `arg` is NaN, then NaN is returned
# Example





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

int main()
{
    printf("scalblnl(3.0, 2) = %Lf\n", scalblnl(3.0, 2));
    printf("scalblnl(5.5, -3) = %Lf\n", scalblnl(5.5,-3));
    printf("scalblnl(7.9, 0) = %Lf\n", scalblnl(7.9, 0));

    return 0;
}

First, we import the `math.h` header file from the C standard library. The program then prints the output of `scalblnl` on possible example values.
>`scalbn`, `scalbnf`, `scalbnl`, `scalbln`, and `scalblnf` perform the same function as `scalblnl` but differ in the data types of `exp` and return value.

What is scalblnl in C?

Multiplies a long double by FLT_RADIX to a user-specified value. Defined in math.h, handles various error scenarios and special cases.