newlib-cygwin/newlib/libm/mathfp/s_ceil.c

39 lines
684 B
C

/* @(#)z_ceil.c 1.0 98/08/13 */
/*****************************************************************
* ceil
*
* Input:
* x - floating point value
*
* Output:
* Smallest integer greater than x.
*
* Description:
* This routine returns the smallest integer greater than x.
*
*****************************************************************/
#include "fdlibm.h"
#include "zmath.h"
#ifndef _DOUBLE_IS_32BITS
double
_DEFUN (ceil, (double),
double x)
{
double f, y;
y = modf (x, &f);
if (y == 0.0)
return (x);
else if (x > -1.0 && x < 1.0)
return (x > 0 ? 1.0 : 0.0);
else
return (x > 0 ? f + 1.0 : f);
}
#endif /* _DOUBLE_IS_32BITS */