27 lines
290 B
C
27 lines
290 B
C
#include <math.h>
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/*
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* floor and ceil-- greatest integer <= arg
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* (resp least >=)
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*/
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double
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floor(double d)
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{
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double fract;
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if(d < 0) {
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fract = modf(-d, &d);
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if(fract != 0.0)
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d += 1;
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d = -d;
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} else
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modf(d, &d);
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return d;
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}
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double
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ceil(double d)
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{
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return -floor(-d);
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}
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