ceil, ceilf, ceill

• 04/05/2018
• 2 minutes to read
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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.

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

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