Manual Pages  — CEIL

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

LIBRARY SYNOPSIS DESCRIPTION SEE ALSO STANDARDS

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.

The ceil() function conforms to ISO/IEC 9899:1990 ("ISO C90"). The ceilf() and ceill() functions conform to ISO/IEC 9899:1999 ("ISO C99").