The Go programming language uses the **`Floor`** function to find the rounded-down or the floor value of a decimal number. 

To use this function, you must import the `math` package in your file and access the `Floor` function within it using the `.` notation (`math.Floor`). Here, `Floor` is the actual function, while `math` is the Go package that stores the definition of this function.

# Function definition

The definition of the `Floor` function inside the `math` package is:


# Parameters
`Floor` function takes a single argument of type float64. This argument represents the number you need to round down.


# Return value

The `Floor` function returns a single value of type float64. This value represents the value of the argument rounded down to the nearest whole number.

An exception to the above statements is when you pass as an argument something that is infinity, `NAN` or 0:

* **(+-)`Inf`**: If the argument has an infinite value, the return value will be exactly the same as the argument.

* **`NAN`**: If a `NAN` argument is passed, the return value is also `NAN`. 

* **(+-)`0`**:  If the argument passed is (+-)`0`the return value will be exactly the same as the argument.



# Examples



Following is a simple example where we find out the floor value of `25.1`:

package main

import (
	"fmt"
	"math"
)

func main() {
	x := 25.1
	y := math.Floor(x)
	fmt.Print(x, " is rounded down to ", y, " using Floor")
}

The following example shows how the `Floor` function handles infinite valued arguments, for which we use the `Inf` function:

> The `Inf` function returns an infinite value with a sign matching the sign of the argument that it is given.

package main

import (
	"fmt"
	"math"
)

func main() {
	x := math.Inf(-1)
	y := math.Floor(x)
	fmt.Print(x, " is rounded down to ", y, " using Floor")
}

What is the Floor function in golang?

Go's Floor function in the math package rounds down float64 numbers, returning the nearest whole number.