# Summing up the method of math rounding

Source: Internet
Author: User

Rounding off Decimal rounding: Math.floor (2) =2
Rounding off Decimal rounding: Math.floor (2.1) =2
Rounding off Decimal rounding: Math.floor (-2.1) =-3
Rounding off Decimal rounding: Math.floor (-2.5) =-3
Rounding off Decimal rounding: Math.floor (2.9) =2
Rounding off Decimal rounding: Math.floor (-2.9) =-3
Summary: Math.floor (x) = largest integer less than x

Rounding off Decimals: Math.ceil (2) =2
Rounding off Decimals: Math.ceil (2.1) =3
Rounding off Decimals: Math.ceil (2.5) =3
Rounding off Decimals: Math.ceil (-2.5) =-2
Rounding off Decimals: Math.ceil (2.9) =3
Rounding off Decimals: Math.ceil (-2.9) =-2
Summary: Math.ceil (x) = smallest integer not less than X

Rounded rounding: Math.Round (3.1) 3
Rounded rounding: Math.Round (3.5) 4
Rounded rounding: Math.Round (-3.1)-3
Rounded rounding: Math.Round (-3.5)-3

Summary: Math.Round (x) = Math.floor (x+0.5) (rounding in mathematical sense)

Rounded rounding: Math.rint (2) =2
Rounded rounding: Math.rint (2.1) =2
Rounded rounding: math.rint (-2.5) =-2
Rounded rounding: math.rint (2.5) =2
Rounded rounding: Math.rint (2.9) =3
Rounded rounding: Math.rint (-2.9) =-3
Rounded rounding: Math.rint (-2.49) =-2
Rounded rounding: Math.rint (-2.51) =-3

Special case: Math.rint ()
1. If the parameter itself is an integer, it returns itself.
2. If it is not a number or infinity or plus or minus 0, the result is itself

Summary: Floor is rounded down, ceil upward, round and rint rounded, rounded with absolute values, and then added with symbols, when encountered. 5. Take even that.

Summing up the method of math rounding

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