# C++ Math lgamma()

The lgamma() function computes the logarithm of a gamma function of an argument passed to the function.

Suppose a number is x: ## Parameter

x: It is a floating point value.

## Return value

It returns the logarithm of a gamma function of value x.

Parameter Return value
x= 1 or x=2 0
x= ±0 +∞
x= -ve integer or ±∞ +∞
x= nan nan

## Example 1

Let's see the simple example when the value of x is 2.

Output:

```Value of x is : 2
lgamma(x) :0
```

In the above example, the value of x is 2. Therefore, the function lgamma() returns 0 value.

## Example 2

Let's see the simple example when the value of x is 0.

Output:

```Value of x is : 0
lgamma(x) : inf
```

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

## Example 3

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

Output:

```Value of x is : -5
lgamma(x) : inf
```

In the above example, the value of x is a negative integer. Therefore, the function lgamma() returns +∞.

## Example 4

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

Output:

```Value of x is : -nan
lgamma(x) :-nan
```

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

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