x = 1.5;
y = -1.5;

a = Ceil(x); //2
b = Ceil(y); //-1
Mes("1.5 -> {a};-1.5 -> {b}");

a = Floor(x); //1
b = Floor(y); //-2

Mes("1.5 -> {a};-1.5 -> {b}");

a = Trunc(x); //1
b = Trunc(y); //-1

Mes("1.5 -> {a};-1.5 -> {b}");