floor, floorf

# floor, floorf

Visual Studio 2010

Calculates the floor of a value.

```double floor(
double x
);
float floor(
float x
); // C++ only
long double floor(
long double x
); // C++ only
float floorf(
float x
);
```

## Parameters

x

Floating-point value.

## Return Value

The floor function returns a floating-point value representing the largest integer that is less than or equal to x. There is no error return.

Input

SEH Exception

Matherr Exception

± QNAN,IND

none

_DOMAIN

floor has an implementation that uses Streaming SIMD Extensions 2 (SSE2). See _set_SSE2_enable for information and restrictions on using the SSE2 implementation.

## Remarks

C++ allows overloading, so you can call overloads of floor. In a C program, floor always takes and returns a double.

## Requirements

Function

floor, floorf

<math.h>

For additional compatibility information, see Compatibility in the Introduction.

## Example

```// crt_floor.c
// This example displays the largest integers
// less than or equal to the floating-point values 2.8
// and -2.8. It then shows the smallest integers greater
// than or equal to 2.8 and -2.8.

#include <math.h>
#include <stdio.h>

int main( void )
{
double y;

y = floor( 2.8 );
printf( "The floor of 2.8 is %f\n", y );
y = floor( -2.8 );
printf( "The floor of -2.8 is %f\n", y );

y = ceil( 2.8 );
printf( "The ceil of 2.8 is %f\n", y );
y = ceil( -2.8 );
printf( "The ceil of -2.8 is %f\n", y );
}
```
```The floor of 2.8 is 2.000000
The floor of -2.8 is -3.000000
The ceil of 2.8 is 3.000000
The ceil of -2.8 is -2.000000```