C++ Math tgamma()

The tgamma() function computes the gamma function of an argument passed to the function.

Suppose a number is x:

$C++ Math tgamma() function$
Syntax

float tgamma(float x); double tgamma(double x); long double tgamma(long double x); double tgamma(double x);

Parameter

x: It is a floating point value.

Return value

It returns the gamma function value of x.

Parameter Return value

x = ±0 ±∞

x = -ve nan

x = -∞ nan

x = +∞ +∞

x = nan nan

Example 1

Let's see the simple example when the value of x is zero.

#include <iostream> #include<math.h> using namespace std; int main() { float x= 0.0; cout<<"Value of x is : "<<x<<'\n'; cout<<"tgamma(x) : "<<tgamma(x); return 0;}

Output:

Value of x is : 0 tgamma(x) : inf

In the above example, the value of x is zero.Therefore, the function tgamma() returns +∞.

Example 2

Let's see the simple example when the value of x is negative.

#include <iostream> #include<math.h> using namespace std; int main() { int x= -6; cout<<"Value of x is : "<<x<<'\n'; cout<<"tgamma(x) : "<<tgamma(x); return 0; }

Output:

Value of x is : -6 tgamma(x) : nan

In the above example, the value of x is a negative integer. Therefore, the function tgamma() returns nan.

Example 3

Let's see the simple example when the value of x is -∞.

#include <iostream> #include<math.h> using namespace std; int main() { float x= -9.0/0.0; cout<<"Value of x is : "<<x<<'\n'; cout<<"tgamma(x): "<<tgamma(x); return 0; }

Output:

Value of x is : -inf tgamma(x): nan

In the above example, the value of x -∞. Therefore, the function tgamma() returns nan.

Example 4

Let's see the simple example when the value of is +∞.

#include <iostream> #include<math.h> using namespace std; int main() { float x= 7.8/0.0; cout<<"Value of x is : "<<x<<'\n'; cout<<"tgamma(x) : "<<tgamma(x); return 0; }

Output:

Value of x is : inf tgamma(x) : inf

In the above example, the value of x is +∞. Therefore, the function tgamma() returns +∞.

Example 5

Let's see the simple example when the value of x is nan.

#include <iostream> #include<math.h> using namespace std; int main() { float x= 0.0/0.0; cout<<"Value of x is : "<<x<<'\n'; cout<<"tgamma(x) : "<<tgamma(x); return 0; }

Output:

Value of x is : -nan tgamma(x) : -nan

In the above example, the value of x is nan. Therefore, the function tgamma() returns nan.

Next TopicC++ Math Functions

← prev next →