ceil, ceilf, ceill

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
long double ceill(
   long double x


Floating-point 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.


SEH Exception

Matherr Exception




ceil has an implementation that uses Streaming SIMD Extensions 2 (SSE2). For information and restrictions about using the SSE2 implementation, see _set_SSE2_enable.

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


Required header

ceil , ceilf, ceill


For additional compatibility information, see Compatibility.

See the example for floor.