# C++ Math erfc()

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

Suppose a number is 'x':

## Parameter

x: It is a floating point value.

## Return value

It returns the complementary error function value of x.

Parameter Return value
x=+∞ +0
x= -∞ 2
x=nan nan

## Example 1

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

Output:

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

In the above example, the value of x is positive infinite. Therefore, the function erfc() returns 0 value.

## Example 2

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

Output:

```Value of x is : -inf
erfc(x) : 2
```

In the above example, the value of x is negative infinite. Therefore, the function erfc() returns 2.

## Example 3

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

Output:

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

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

Next TopicC++ Math Functions

### Feedback   