C++ Math scalbn
The function computes the product of a given number and FLT_RADX raised to the power of exponent.
Suppose a number is 'x' and exponent is 'n':
Example
scalbn(x,n) = x * ( FLT_RADX)n
Syntax
Example
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);
Parameter
x : The value of the significand.
n : The value of the exponent.
Return value
It returns the product of x and FLT_RADX raised to the power n.
Example 1
Let's see the simple example when the value of x is integer type.
Example
#include <iostream>
#include<math.h>
#include<float.h>
using namespace std;
int main()
{
int x=4;
int n=2;
std::cout << "Value of x is : " <<x<< std::endl;
cout<<"4 * 2^2 = "<<scalbn(x,n);
return 0;
}
Output:
Output
Value of x is : 4
4 * 2^2 = 16
In this example, the value of x is 4. Therefore, scalbn function scales 4 by FLT_RADX raised to the power 2.
Example 2
Let's see the simple example when the value of x is float type.
Example
#include <iostream>
#include<math.h>
#include<float.h>
using namespace std;
int main()
{
float x=3.4;
int n=5;
std::cout << "Value of x is : " <<x<< std::endl;
cout<<"3.4 * 2^5 = "<<scalbn(x,n);
return 0;
}
Output:
Output
Value of x is : 3.4
3.4 * 2^5 = 108.8
In this example, the value of x is 3.4. Therefore, scalbn function scales 3.4 by FLT_RADX raised to the power 5.