Math.ceil, Math.floor,Math.round

Math.ceil(double); //올림

Math.floor(double); //버림

Math.round(double);  Math.round(flaot); //반올림

double d = 100d/8d;

System.out.println( d );

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

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

System.out.println(Math.round( d ));

--결과--

12.5

13.0

12.0

13