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ceil, ceilf
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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
);

x

Floating-point 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.

C++ allows overloading, so you can call overloads of ceil. In a C program, ceil always takes and returns a double.

Routine

Required header

ceil , ceilf

<math.h>

For additional compatibility information, see Compatibility in the Introduction.

See the example for floor.

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