# GoLang – Find Complementary Error Function – Erfc() Function – Examples & Explanation

`Erfc()` function is used to find the complementary error function of the given input (`x` – parameter) in Go language. The standard math package of Go programming language has `Erfc()` function. The purpose of this function is to find the complementary error function.

## Syntax of `Erfc()` Function in Go Language

The syntax of `Erfc()` function in Go Language is:

```func Erfc(x float64) float64
```

Note: `float64` is a data type in Go language which has IEEE-754 64-bit floating-point numbers.
Special cases are:
```Erfc(+Inf) = 0 Erfc(-Inf) = 2 Erfc(NaN) = NaN```

## Parameters of `Erfc()` Function in Go Language

`x ` – Where `x` is any Valid `float64` Input value. This parameter is required.

## Error Handling

If the `x ` parameter is not a number (numeric value) `Erfc()` function returns an `error `.
If there is no argument (`x` – input value) passes to the function, then the compiler will produce an `error`.

## Return Value of `Erfc()` Function in Go

`Erfc()` function will return the complementary error function of the given input(`x ` – parameter).

## GoLang `Erfc()` Function Example 1

```package main

import "fmt"
import "math"

func main() {
var x float64
x = math.Erfc(7)
fmt.Println(x)
}
```

Output:
` 4.183825607779414e-23`

## GoLang `Erfc()` Function Example 2

```package main

import "fmt"
import "math"

func main() {
var x float64
x = math.Erfc(-20)
fmt.Println(x)
}
```

Output:
` 2`

## GoLang `Erfc() ` Function Example 3

```package main

import "fmt"
import "math"

func main() {
var x float64
x = math.Erfc(0)
fmt.Println(x)
}
```

Output:
`1`