NAME

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

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h>

double
ceil(double x);

float
ceilf(float x);

long double
ceill(long double x);

DESCRIPTION

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

SEE ALSO

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

STANDARDS

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