ceil, ceilf, ceill
Calculates the ceiling of a value.
Syntax
double ceil(
double x
);
float ceil(
float x
); // C++ only
long double ceil(
long double x
); // C++ only
float ceilf(
float x
);
long double ceill(
long double x
);
Parameters
x
Floating-point value.
Return Value
The ceil functions return a floating-point value that represents 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). For information and restrictions about using the SSE2 implementation, see _set_SSE2_enable.
Remarks
Because C++ allows overloading, you can call overloads of ceil that take float or long double types. In a C program, ceil always takes and returns a double.
Requirements
Routine | Required header |
---|---|
ceil, ceilf, ceill | <math.h> |
For additional compatibility information, see Compatibility.
Example
See the example for floor.
See also
Floating-Point Support
floor, floorf, floorl
fmod, fmodf
round, roundf, roundl
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