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
);

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.

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

For additional compatibility information, see Compatibility in the Introduction.

Example

See the example for floor.

.NET Framework Equivalent

System::Math::Ceiling

See Also

Concepts

Floating-Point Support

floor, floorf

fmod, fmodf