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C++ Math tgamma() Function

C++ Math tgamma() 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 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 
#include
using namespace std;
int main()
{
     float x= 0.0;
     cout<<"Value of x is : "<

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

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 
#include
using namespace std;
int main()
{
     float x= -9.0/0.0;
     cout<<"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 +∞.

#include 
#include
using namespace std;
int main()
{
     float x= 7.8/0.0;
     cout<<"Value of x 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.

#include 
#include
using namespace std;
int main()
{
     float x= 0.0/0.0;
     cout<<"Value of x is : "<

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




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