C++ Math erf()

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

Syntax

Suppose a number is ‘x’:

Parameter

x: It is a floating point value.

Return value

It returns the error function value of x.

Example 1

Let’s see the simple example.

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.

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.

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.

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.