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ceil, ceilf

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

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