BigInteger.LeftShift(BigInteger, Int32) 运算符

定义

BigInteger 值向左移动指定的位数。Shifts a BigInteger value a specified number of bits to the left.

public:
 static System::Numerics::BigInteger operator <<(System::Numerics::BigInteger value, int shift);
public static System.Numerics.BigInteger operator << (System.Numerics.BigInteger value, int shift);
static member ( <<< ) : System.Numerics.BigInteger * int -> System.Numerics.BigInteger
Public Shared Operator << (value As BigInteger, shift As Integer) As BigInteger

参数

value
BigInteger

要移动其位的值。The value whose bits are to be shifted.

shift
Int32

value 向左移动的位数。The number of bits to shift value to the left.

返回

一个已向左移动指定位数的值。A value that has been shifted to the left by the specified number of bits.

注解

LeftShift 方法定义 BigInteger 值的按位左移运算符的运算。The LeftShift method defines the operation of the bitwise left-shift operator for BigInteger values. 它可以实现如下所示的代码:It enables code such as the following:

BigInteger number = BigInteger.Parse("-9047321678449816249999312055");
Console.WriteLine("Shifting {0} left by:", number);
for (int ctr = 0; ctr <= 16; ctr++)
{
   BigInteger newNumber = number << ctr;
   Console.WriteLine(" {0,2} bits: {1,35} {2,30}", 
                     ctr, newNumber, newNumber.ToString("X"));
}
// The example displays the following output:
//    Shifting -9047321678449816249999312055 left by:
//      0 bits:       -9047321678449816249999312055       E2C43B1D0D6F07D2CC1FBB49
//      1 bits:      -18094643356899632499998624110       C588763A1ADE0FA5983F7692
//      2 bits:      -36189286713799264999997248220       8B10EC7435BC1F4B307EED24
//      3 bits:      -72378573427598529999994496440      F1621D8E86B783E9660FDDA48
//      4 bits: -1.4475714685519705999998899288E+29      E2C43B1D0D6F07D2CC1FBB490
//      5 bits: -2.8951429371039411999997798576E+29      C588763A1ADE0FA5983F76920
//      6 bits: -5.7902858742078823999995597152E+29      8B10EC7435BC1F4B307EED240
//      7 bits:  -1.158057174841576479999911943E+30     F1621D8E86B783E9660FDDA480
//      8 bits: -2.3161143496831529599998238861E+30     E2C43B1D0D6F07D2CC1FBB4900
//      9 bits: -4.6322286993663059199996477722E+30     C588763A1ADE0FA5983F769200
//     10 bits: -9.2644573987326118399992955443E+30     8B10EC7435BC1F4B307EED2400
//     11 bits: -1.8528914797465223679998591089E+31    F1621D8E86B783E9660FDDA4800
//     12 bits: -3.7057829594930447359997182177E+31    E2C43B1D0D6F07D2CC1FBB49000
//     13 bits: -7.4115659189860894719994364355E+31    C588763A1ADE0FA5983F7692000
//     14 bits: -1.4823131837972178943998872871E+32    8B10EC7435BC1F4B307EED24000
//     15 bits: -2.9646263675944357887997745742E+32   F1621D8E86B783E9660FDDA48000
//     16 bits: -5.9292527351888715775995491484E+32   E2C43B1D0D6F07D2CC1FBB490000      
Dim number As BigInteger = BigInteger.Parse("-9047321678449816249999312055")
Console.WriteLine("Shifting {0} left by:", number)
For ctr As Integer = 0 To 16
   Dim newNumber As BigInteger = number << ctr
   Console.WriteLine(" {0,2} bits: {1,35} {2,30}", ctr, newNumber, newNumber.ToString("X"))
Next
' The example displays the following output:
'    Shifting -9047321678449816249999312055 left by:
'      0 bits:       -9047321678449816249999312055       E2C43B1D0D6F07D2CC1FBB49
'      1 bits:      -18094643356899632499998624110       C588763A1ADE0FA5983F7692
'      2 bits:      -36189286713799264999997248220       8B10EC7435BC1F4B307EED24
'      3 bits:      -72378573427598529999994496440      F1621D8E86B783E9660FDDA48
'      4 bits: -1.4475714685519705999998899288E+29      E2C43B1D0D6F07D2CC1FBB490
'      5 bits: -2.8951429371039411999997798576E+29      C588763A1ADE0FA5983F76920
'      6 bits: -5.7902858742078823999995597152E+29      8B10EC7435BC1F4B307EED240
'      7 bits:  -1.158057174841576479999911943E+30     F1621D8E86B783E9660FDDA480
'      8 bits: -2.3161143496831529599998238861E+30     E2C43B1D0D6F07D2CC1FBB4900
'      9 bits: -4.6322286993663059199996477722E+30     C588763A1ADE0FA5983F769200
'     10 bits: -9.2644573987326118399992955443E+30     8B10EC7435BC1F4B307EED2400
'     11 bits: -1.8528914797465223679998591089E+31    F1621D8E86B783E9660FDDA4800
'     12 bits: -3.7057829594930447359997182177E+31    E2C43B1D0D6F07D2CC1FBB49000
'     13 bits: -7.4115659189860894719994364355E+31    C588763A1ADE0FA5983F7692000
'     14 bits: -1.4823131837972178943998872871E+32    8B10EC7435BC1F4B307EED24000
'     15 bits: -2.9646263675944357887997745742E+32   F1621D8E86B783E9660FDDA48000
'     16 bits: -5.9292527351888715775995491484E+32   E2C43B1D0D6F07D2CC1FBB490000      

备注

与整数基元的按位左移运算不同,LeftShift 方法保留原始 BigInteger 值的符号。Unlike the bitwise left-shift operation with integer primitives, the LeftShift method preserves the sign of the original BigInteger value.

不支持自定义运算符的语言可以通过将 value 乘以 BigInteger.Pow(2, shift)来执行按位左移运算。Languages that do not support custom operators can perform a bitwise left-shift operation by multiplying value by BigInteger.Pow(2, shift). 下面的示例演示结果与使用此运算符的结果相同。The following example shows that the results are identical to the results of using this operator.

BigInteger number = BigInteger.Parse("-9047321678449816249999312055");
Console.WriteLine("Shifting {0} left by:", number);
for (int ctr = 0; ctr <= 16; ctr++)
{
   BigInteger newNumber = BigInteger.Multiply(number, BigInteger.Pow(2, ctr));
   Console.WriteLine(" {0,2} bits: {1,35} {2,30}", 
                     ctr, newNumber, newNumber.ToString("X"));
}
// The example displays the following output:
//    Shifting -9047321678449816249999312055 left by:
//      0 bits:       -9047321678449816249999312055       E2C43B1D0D6F07D2CC1FBB49
//      1 bits:      -18094643356899632499998624110       C588763A1ADE0FA5983F7692
//      2 bits:      -36189286713799264999997248220       8B10EC7435BC1F4B307EED24
//      3 bits:      -72378573427598529999994496440      F1621D8E86B783E9660FDDA48
//      4 bits: -1.4475714685519705999998899288E+29      E2C43B1D0D6F07D2CC1FBB490
//      5 bits: -2.8951429371039411999997798576E+29      C588763A1ADE0FA5983F76920
//      6 bits: -5.7902858742078823999995597152E+29      8B10EC7435BC1F4B307EED240
//      7 bits:  -1.158057174841576479999911943E+30     F1621D8E86B783E9660FDDA480
//      8 bits: -2.3161143496831529599998238861E+30     E2C43B1D0D6F07D2CC1FBB4900
//      9 bits: -4.6322286993663059199996477722E+30     C588763A1ADE0FA5983F769200
//     10 bits: -9.2644573987326118399992955443E+30     8B10EC7435BC1F4B307EED2400
//     11 bits: -1.8528914797465223679998591089E+31    F1621D8E86B783E9660FDDA4800
//     12 bits: -3.7057829594930447359997182177E+31    E2C43B1D0D6F07D2CC1FBB49000
//     13 bits: -7.4115659189860894719994364355E+31    C588763A1ADE0FA5983F7692000
//     14 bits: -1.4823131837972178943998872871E+32    8B10EC7435BC1F4B307EED24000
//     15 bits: -2.9646263675944357887997745742E+32   F1621D8E86B783E9660FDDA48000
//     16 bits: -5.9292527351888715775995491484E+32   E2C43B1D0D6F07D2CC1FBB490000      
Dim number As BigInteger = BigInteger.Parse("-9047321678449816249999312055")
Console.WriteLine("Shifting {0} left by:", number)
For ctr As Integer = 0 To 16
   Dim newNumber As BigInteger = BigInteger.Multiply(number, BigInteger.Pow(2, ctr))
   Console.WriteLine(" {0,2} bits: {1,35} {2,30}", 
                     ctr, newNumber, newNumber.ToString("X"))
Next
' The example displays the following output:
'    Shifting -9047321678449816249999312055 left by:
'      0 bits:       -9047321678449816249999312055       E2C43B1D0D6F07D2CC1FBB49
'      1 bits:      -18094643356899632499998624110       C588763A1ADE0FA5983F7692
'      2 bits:      -36189286713799264999997248220       8B10EC7435BC1F4B307EED24
'      3 bits:      -72378573427598529999994496440      F1621D8E86B783E9660FDDA48
'      4 bits: -1.4475714685519705999998899288E+29      E2C43B1D0D6F07D2CC1FBB490
'      5 bits: -2.8951429371039411999997798576E+29      C588763A1ADE0FA5983F76920
'      6 bits: -5.7902858742078823999995597152E+29      8B10EC7435BC1F4B307EED240
'      7 bits:  -1.158057174841576479999911943E+30     F1621D8E86B783E9660FDDA480
'      8 bits: -2.3161143496831529599998238861E+30     E2C43B1D0D6F07D2CC1FBB4900
'      9 bits: -4.6322286993663059199996477722E+30     C588763A1ADE0FA5983F769200
'     10 bits: -9.2644573987326118399992955443E+30     8B10EC7435BC1F4B307EED2400
'     11 bits: -1.8528914797465223679998591089E+31    F1621D8E86B783E9660FDDA4800
'     12 bits: -3.7057829594930447359997182177E+31    E2C43B1D0D6F07D2CC1FBB49000
'     13 bits: -7.4115659189860894719994364355E+31    C588763A1ADE0FA5983F7692000
'     14 bits: -1.4823131837972178943998872871E+32    8B10EC7435BC1F4B307EED24000
'     15 bits: -2.9646263675944357887997745742E+32   F1621D8E86B783E9660FDDA48000
'     16 bits: -5.9292527351888715775995491484E+32   E2C43B1D0D6F07D2CC1FBB490000      

适用于

另请参阅