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double floor(double d)

double floor(float f)

public class Test{
    public static void main(String args[]){
        double d = 100.675;
        float f = -90;

        System.out.println(Math.floor(d));
        System.out.println(Math.floor(f));

        System.out.println(Math.ceil(d));
        System.out.println(Math.ceil(f));
    }
}

100.0
-90.0
101.0
-90.0