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
);
Parameters
- 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 |
|---|---|
ceil, ceilf |
<math.h> |
For additional compatibility information, see Compatibility in the Introduction.
Example
See the example for floor.