C++ Math scalbn() Function

by Online Tutorials Library July 22, 2022

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’:

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);  

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.

  #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:

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.

  #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:

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.

Next TopicC++ Math Functions

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