C++ Math tgamma()

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

Suppose a number is x:

Syntax

Parameter

x: It is a floating point value.

Return value

It returns the gamma function value of x.

Example 1

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

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.

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 -∞.

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 +∞.

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.

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.