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scalbn() function in C++
In this article we will be discussing the working, syntax and examples of scalbn() function in C++ STL.
What is scalbn()?
scalbn() function is an inbuilt function in C++ STL, which is defined in the <cmath> header file. scalbn() function is used to scale significantly using the floating point base exponent.
Significand is a part of a floating-point number consisting of its significant digits, depending upon the interpretation of the exponent significand can be an integer or a fraction.
The function calculates the product of num and FLT_RADIX to the power n, where FLT_RADIX is the base of all floating point data types and num is the significant value. And n exponent value
Syntax
double scalbn( double num, int n ); float scalbn( float num, int n ); long double scalbn( long double num, int n );
Parameters
The function accepts following parameter(s) −
- num − It is the value of significand.
- n − It is the value exponent.
Return value
This function returns num * FLT_RADIX^n if it is a success, else returns math_errhandling error.
Example
Input
scalbn(5, 7);
Output
640
Example
#include <bits/stdc++.h>
using namespace std;
int main(){
int a = 7;
int b = 5;
int hold;
hold = scalbn(b, a);
cout <<"Equation is: "<< b << " * " << FLT_RADIX << "^" << a << " = "<<hold<< endl;
return 0;
}Output
Equation is: 5 * 2^7 = 640
Example
#include <bits/stdc++.h>
using namespace std;
int main(){
float a = 2.3;
float b = 7.8;
float hold;
hold = scalbn(b, a);
cout <<"Equation is: "<< b << " * " << FLT_RADIX << "^" << a << " = "<<hold<< endl;
return 0;
}Output
Equation is: 7.8 * 2^2.3 = 31.2
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