Calculates the double value corresponding to the smallest integer that is greater than or equal to x.
double ceil( double x )
ceil(x)
EX1
void ceil_ex1() { double x1 = -4.6, x2 = 4.6; printf("ceil(%f) = %f\nceil(%f) = %f\n", x1, ceil(x1), x2, ceil(x2)); }
floor
origin.h