scalbn() function in C++

The scalbn() function is defined in the cmath header file. This function is used to calculate the product of given number x and FLT_RADIX raised to the power n.

Syntax:-

float scalbn(float x, int n);

double scalbn(double x, int n);

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

double scalbn(integral x, int n);

Parameters:- This method takes two parameters:

x: This represents the value of significand.
n: This represents the value of the exponent.

Return Value: This function returns the product of given number x and FLT_RADIX raised to the power n. with the help of formula:

scalbn(x, n) = x * FLT_RADIXn

Below programs illustrate the above function:-

Example 1:-

// C++ program to demonstrate 
// example of scalbn() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    int n = 7; 
    int x = 5; 
    int ans; 
  
    ans = scalbn(x, n); 
    cout << x << " * "
         << FLT_RADIX << "^"
         << n << " = "
         << ans << endl; 
  
    return 0; 
} 

Output:

5 * 2^7 = 640

Example 2:-

// C++ program to demonstrate 
// example of scalbn() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    int n = 7; 
    double x = 3.9; 
    int ans; 
  
    ans = scalbn(x, n); 
    cout << x << " * "
         << FLT_RADIX << "^"
         << n << " = "
         << ans << endl; 
  
    return 0; 
} 

Output:

3.9 * 2^7 = 499

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