Shl
Value = Shl ( Number , Bit )
Value = Number Shl Bit
Returns
Number shifted to the left by
Bit bits. The sign of
Number is kept.
Shl now can be used as an operator.
The type of
Number may be
Byte,
Short,
Integer, or
Long.
The valid range of
Bit depends on the type of the
Number argument.
The datatype of the return value is the datatype of Number.
Errors
Examples
PRINT Bin(11, 32), 11
PRINT Bin(Shl(11, 2), 32), Shl(11, 2)
PRINT Bin(Shl(11, 28), 32), Shl(11, 28)
00000000000000000000000000001011 11
00000000000000000000000000101100 44
00110000000000000000000000000000 805306368
PRINT Bin(-11, 32), -11
PRINT Bin(Shl(-11, 2), 32), Shl(-11, 2)
PRINT Bin(Shl(-11, 28), 32), Shl(-11, 28)
11111111111111111111111111110101 -11
11111111111111111111111111010100 -44
11010000000000000000000000000000 -805306368
It may be useful to expand the type of an argument.
Use for this
CLong,
CInt or
CShort.
DIM b1 AS Byte
DIM i1 AS Integer
DIM i2 AS Integer
b1 = &H55
' Bad Argument, maximum = 7 for Byte for Integer : s2 = Shl(b1, 8) OR b2
i1 = Shl(CInt(b1), 16)
PRINT "i1="; Hex$(i1)
Try i2 = Shl(b1, 16) ' Stops here with Bad Argument
If Error then
Print Error.Text
Else
PRINT " i2="; Hex$(i2)
Endif
See also