# beta(), betaf() and betal() functions in C++ STL

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The functions beta(), betaf() and betal() are built-in functions in the standard template library of C++. These functions are used to calculate the beta function of two positive real numbers.

The functions beta(), betaf() and betal() are built-in functions in the standard template library of C++. These functions are used to calculate the beta function of two positive real numbers.

$B(x,y)=\int_{0}^{1}t^{(x-1)}(1-t)^{(y-1)}dt$

## beta()

The beta() function is used to deal with values of data type double i.e. it accepts the parameter of double type and returns are double value.

## Syntax

double beta(double x, double y)

## Parameters

x is a double value that gives the value of x in the beta function.
y is a double value that gives the value of y in the beta function.

Returns a double value which is beta function result.

## Example

#include <bits/stdc++.h>
using namespace std;
int main(){
double x = 4.93;
double y = 5.01;
double result = beta(x, y);
cout<<"B("<<x<<" , "<<y<<") = "<<result<<"\n";
return 0;
}

## Output

B(4.93 , 5.01) = 0.00166054

## betaf()

The betaf() function is used to deal with values of data type float i.e. it accepts the parameter of float type and returns are float value.

## Syntax

float beta(float x, float y

## Parameters

x is a float value that gives the value of x in the beta function.
y is a float value that gives the value of y in the beta function.

Returns a float value which is beta function result.

## Example

#include <bits/stdc++.h>
using namespace std;
int main(){
float x = 0.31;
float y = 3.99;
float result = betaf(x, y);
cout<<"B("<<x<<" , "<<y<<") = "<<result<<"\n";
return 0;
}

## Output

B(0.31 , 3.99) = 1.93395

## betal()

The betal() function is used to deal with values of data type long double i.e. it accepts the parameter of long double type and returns a long double value.

## Syntax

long double beta(long double x, long double y)

## Parameters

x is a long double value that gives the value of x in the beta function.
y is a long double value that gives the value of y in the beta function.

Returns a long double value which is beta function result.

## Example

#include <bits/stdc++.h>
using namespace std;
int main(){
long double x = 3453.35451;
long double y = 9862.89651;
long double result = betaf(x, y);
cout<<"B("<<x<<" , "<<y<<") = "<<result<<"\n";
return 0;
}

## Output

B(3453.35 , 9862.9) = 4.39947e-3312
Published on 17-Jul-2020 12:03:46