Fix is rounded to zero, such as fix (-1.3) =-1; fix( 1.3)= 1；

Floor is rounded to negative infinity, such as floor (-1.3) =-2; Floor (1.3) =1;

Ceil is rounded to positive infinity, such as Ceil (-1.3) =-1; ceil( 1.3)= 2；

Round is rounded to the nearest integer, such as round (-1.3) =-1; round(- 1.52)=-2；

1.000 can be treated as 1 with floor circle fix.

But if you are rounding off the tail, use floor.