ceil, ceilf
Visual Studio .NET 2003
Calculates the ceiling of a value.
double ceil( double x ); float ceil( float x ); // C++ only long double ceil( long double x ); // C++ only float ceilf( float x );
Parameter
- x
- Floating-point value.
Return Value
The ceil function returns a double value representing the smallest integer that is greater than or equal to x. There is no error return.
| Input | SEH Exception | Matherr Exception |
|---|---|---|
| ± QNAN,IND | none | _DOMAIN |
ceil 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 ceil. In a C program, ceil always takes and returns a double.
Requirements
| Routine | Required header | Compatibility |
|---|---|---|
| ceil, ceilf | <math.h> | ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
All versions of the C run-time libraries.
Example
See the example for floor.
See Also
Floating-Point Support Routines | floor | fmod | Run-Time Routines and .NET Framework Equivalents
