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scalbn() Function with Example in C++

C++ scalbn() function: Here, we are going to learn about the scalbn() function with example of cmath header in C++ programming language.
Submitted by IncludeHelp, on May 25, 2020

C++ scalbn() function

scalbn() function is a library function of cmath header. It scales the significand using floating-point base exponent (int) i.e. it is used to calculate the product of the given significand and FLT_RADIX raised to the power of the given exponent. It accepts two parameters significand and exponent and returns the result of significand * FLT_RADIX^exponent.

Syntax of scalbn() function:

C++11:

     double scalbn (double x     , int n);
      float scalbn (float x      , int n);
long double scalbn (long double x, int n);
     double scalbn (T x          , int n);

Parameter(s):

x, n – represent the value of significand and exponent.

Return value:

It returns the product of the given significand and FLT_RADIX raised to the power of the given exponent.

Example:

    Input:
    double x = 10;
    int n = 2;
    
    Function call:
    scalbn(x,n);
    
    Output:
    40

C++ code to demonstrate the example of scalbn() function

// C++ code to demonstrate the example of
// scalbn() function

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

// main() section
int main()
{
    double x;
    int n;

    x = 10;
    n = 2;
    cout << "scalbn(" << x << "," << n << "): " << scalbn(x, n);
    cout << endl;

    x = 5.3;
    n = 2;
    cout << "scalbn(" << x << "," << n << "): " << scalbn(x, n);
    cout << endl;

    x = 15.46;
    n = 12.56;
    cout << "scalbn(" << x << "," << n << "): " << scalbn(x, n);
    cout << endl;

    x = -10.2;
    n = 2;
    cout << "scalbn(" << x << "," << n << "): " << scalbn(x, n);
    cout << endl;

    return 0;
}

Output

scalbn(10,2): 40
scalbn(5.3,2): 21.2
scalbn(15.46,12): 63324.2
scalbn(-10.2,2): -40.8