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Man Pages
CEIL(3) FreeBSD Library Functions Manual CEIL(3)

ceil, ceilf, ceill
smallest integral value greater than or equal to x

Math Library (libm, -lm)

#include <math.h>
double
ceil(double x);
float
ceilf(float x);
long double
ceill(long double x);

The ceil(), ceilf() and ceill() functions return the smallest integral value greater than or equal to x, expressed as a floating-point number.

abs(3), fabs(3), floor(3), ieee(3), math(3), rint(3), round(3), trunc(3)

The ceil() function conforms to ISO/IEC 9899:1990 (“ISO C90”). The ceilf() and ceill() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
January 13, 2005 FreeBSD 12.0-RELEASE

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