scalbln() function in C++ STL

The scalbln() is a built-in function in C++ STL which takes two arguments and scales x by FLT_RADIX raised to the power n. The function returns the product of x and FLT_RADIX raised to the power n. FLT_RADIX: It is the value of the radix (integer base) of the exponent representation. Syntax:

scalbln (x, n)

Parameters: The function accepts two mandatory parameters which are described below:

• x- It specifies the value representing the significand. The data-type can be double, float or long-double.
• n- It specifies the exponent of FLT_RADIX. The parameter is of data-type long-int.

Return Type: The function returns the product of x and FLT_RADIX raised to the power n. The returned value is of the same data-type as of x. Below programs illustrate the above function: Program 1: CPP

// C++ program to illustrate
// scalbln() function
#include <bits/stdc++.h>
using namespace std;

int main()
{
    long int n = 0;
    double x = 2.12, result;
    result = scalbln(x, n);
    cout << x << " * " << FLT_RADIX << "^" 
    << n << " = " << result << endl;

    return 0;
}

Program 2: CPP

// C++ program to illustrate
// scalbln() function
#include <bits/stdc++.h>
using namespace std;

int main()
{
    long int n = 9999999;
    double x = 19.8, result;
    result = scalbln(x, n);
    cout << x << " * " << FLT_RADIX << "^" 
    << n << " = " << result << endl;

    return 0;
}