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