Math. Floor and math. Ceil Functions

Public class ceilandfloor {
Public static void main (string [] ARGs ){
/*
The main task of these two functions is to cut off the digits after decimal places.
The difference is that floor always keeps the number smaller, while Ceil always increases the number.
In fact, the name can be understood as floor is the floor, and ceil is the ceiling.
*/
System. out. println ("================= math. floor () ================ ");
System. Out. println ("math. Floor (99.1) =" + math. Floor (99.1 ));
System. Out. println ("math. Floor (-99.1) =" + math. Floor (-99.1 ));
System. Out. println ("math. Floor (99.9) =" + math. Floor (99.9 ));
System. Out. println ("math. Floor (-99.9) =" + math. Floor (-99.9 ));
System. out. println ("\ n ================= math. ceil () ================ ");
System. Out. println ("math. Ceil (99.1) =" + math. Ceil (99.1 ));
System. Out. println ("math. Ceil (-99.1) =" + math. Ceil (-99.1 ));
System. Out. println ("math. Ceil (99.9) =" + math. Ceil (99.9 ));
System. Out. println ("math. Ceil (-99.9) =" + math. Ceil (-99.9 ));
}
}
Result
================= Math. Floor () ========================
Math. Floor (99.1) = 99.0
Math. Floor (-99.1) =-100.0
Math. Floor (99.9) = 99.0
Math. Floor (-99.9) =-100.0
=============== Math. Ceil () ==========================
Math. Ceil (99.1) = 100.0
Math. Ceil (-99.1) =-99.0
Math. Ceil (99.9) = 100.0
Math. Ceil (-99.9) =-99.0