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C++ Math lgamma() Function

C++ Math lgamma() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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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:

C++ Math lgamma() function

Syntax

float lgamma(float x);
double lgamma(double x);
long double lgamma(long double x);
double lgamma(integral 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.

#include 
#include
using namespace std;
int main()
{
     int x=2;
     cout<<"Value of x is : "<

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.

#include 
#include
using namespace std;
int main()
{
     int x=0;
     cout<<"Value of x is : "<

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.

#include 
#include
using namespace std;
int main()
{
     int x= -5;
     cout<<"Value of x is : "<

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.

#include 
#include
using namespace std;
int main()
{
     float x=sqrt(-6);
     cout<<"Value of x is : "<

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.


Next TopicC++ Math Functions




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