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C++ Math erf() Function

C++ Math erf() 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 erf()

The erf() function computes the error function value of a parameter passed to the function.

C++ Math erf() function

Syntax

Suppose a number is 'x':

float erf( float x);
double erf( double x);
long double erf( long double x);
double erf( integral x);

Parameter

x: It is a floating point value.

Return value

It returns the error function value of x.

Parameter Return value
x=±0 ±0
x=± infinite ±1
x=nan nan

Example 1

Let's see the simple example.

#include 
#include
using namespace std;
int main()
{
     double x= 6.2;
     cout<<"Value of x is : "<

Output:

Value of x is : 6.2
erf(x) : 1

In the above example, value of x is 6.2. The erf() function returns the value i.e 1.

Example 2

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

#include 
#include
using namespace std;
int main()
{
     double x= 1.0/0.0;
     cout<<"Value of x is : "<

Output:

Value of x is : inf
erf(x) : 1

In the above example, the value of x is infinite. Therefore, the function erf() returns the value 1.

Example 3

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
erf(x) : 0

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

Example 4

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
erf(x) : -nan

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


Next TopicC++ Math Functions




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