round 取整數
truncate 無條件捨去 ??
array 陣列
rounddown 無條件捨去
roundup 無條件進位
a
|
b
|
I3
|
I2
|
I1
|
I0
|
0
|
0
|
0
|
0
|
0
|
1
|
0
|
1
|
0
|
0
|
1
|
0
|
1
|
0
|
0
|
1
|
0
|
0
|
1
|
1
|
1
|
0
|
0
|
0
|