C++ Math scalbln() Function

by Online Tutorials Library July 22, 2022

C++ Math scalbln()

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 scalbln(float x, long int n);  double scalbln(double x, long int n);  long double scalbln(long double x, long int n);  double scalbln(integral x, long 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 an integer type.

  #include <iostream>  #include<math.h>  #include<float.h>  using namespace std;  int main()  {   int x=3;   long n=3L;   std::cout << “Value of x is: ” <<x<< std::endl;   cout<<“3 * 2^3 = “<<scalbn(x,n);  return 0;  }  

Output:

Value of x is: 3  3 * 2^3 = 24

Example 2

Let’s see the simple example when the value of x is a float type

  #include <iostream>  #include<math.h>  #include<float.h>  using namespace std;  int main()  {   float x=7.2;   long n=2L;   std::cout << “Value of x is : ” <<x<< std::endl;   cout<<“7.2 * 2^2 = “<<scalbln(x,n);   return 0;  }  

Output:

Value of x is : 7.2  7.2 * 2^2 = 28.8

Next TopicC++ Math Functions

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