We use the **`scalbnl()`** function to compute the product of a given number with **`FLT_RADIX`** raised to the given power. It is a variation of the `scalbn()` function when the mantissa value is of type long double.

`FLT_RADIX` is a constant which serves as the base of the exponent. Usually, in all computers, this value is 2.

# Library For C++
```c++
#include<cmath>
``` 

# Library For C
```c
#include<math.h>
``` 
> We have to use `#include<cfloat>` library for C++ and `#include<float.h>` library for C language to access `FLT_RADIX` .
# Syntax
```c
long double scalbnl(long double num, int n)
```

# Parameters

`num:` Input value is of long double type. This is the coefficient or mantissa value.

`n:` Exponent value or the number to which `FLT_RADIX` is raised.

# Return value
The return value is the product of the given number, `num`, with `FLT_RADIX` raised to power `n.`

# Formula









#include <iostream>
#include<cmath>
#include <cfloat>
using namespace std;

int main()
{
  long double num = 100.9;
  int n = 4;
  long double result = 0;
  cout << num << " * " << FLT_RADIX << "^" << n << " = " << scalbnl(num , n) << endl;

}

What is scalbnl in C/C++?

Compute the product of a number with FLT_RADIX raised to a given power using scalbnl().

What is scalbnl in C/C++?

Library For C++

Library For C

Syntax

Parameters

Return value

Formula

Code