floor, floorf
Visual Studio 2008
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 );
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.
Function | Required header |
|---|---|
floor, floorf | <math.h> |
For additional compatibility information, see Compatibility in the Introduction.
// 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 );
}
