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