double
ceil(double x);
long double
ceill(long double x);
float
ceilf(float x);
The ceil() functions return the smallest integral value greater than or
equal to x.
ceil(+-0) returns +-0.
ceil(+-infinity) returns +-infinity.
abs(3), fabs(3), floor(3), rint(3), math(3)
The ceil() functions conform to ISO/IEC 9899:1999(E).
BSD July 2, 2003 BSD