Java_C++_C# 移位运算符比较

Java语言的移位运算符

Java语言的移位运算符: <<, >>, >>>共3种.
publicclass Test
{

publicstaticvoidmain(String[]
args)

{

/*

* 移位运算符只对byte,short,int,long和char类型有效

*/

//有(无)符号数,
左移(<<),最高位符号位都将被右边的位覆盖

bytenum = (byte)0x8F;

num<<= 1;

System.out.println("10001111<< 1 = " + Integer.toBinaryString(num));

num = (byte)0x7F;

num<<= 1;

System.out.println("01111111<< 1 = " + Integer.toBinaryString(num));

//有(无)符号数,
右移(>>),最高位符号位都将保留

num = (byte)0x8F;

num>>= 1;

System.out.println("10001111>> 1 = " + Integer.toBinaryString(num));

num = (byte)0x7F;

num>>= 1;

System.out.println("01111111>> 1 = " + Integer.toBinaryString(num));

//有(无)符号数(只对32位和64位数有效),无符号右移(>>>),最高位符号位都将变成0

intn =0x8FFFFFFF;

n>>>= 1;

System.out.println("0x8FFFFFFF>>> 1 = " + Integer.toHexString(n));

n =0x7FFFFFFF;

n>>>= 1;

System.out.println("0x7FFFFFFF>>> 1 = " + Integer.toHexString(n));

}
}

运算结果,如下:

10001111 << 1 = 00011110
01111111 << 1 = 11111110
10001111 >> 1 = 11000111
01111111 >> 1 = 00111111
0x8FFFFFFF >>> 1 = 0x47FFFFFF
0x7FFFFFFF >>> 1 = 0x 3FFFFFFF

C++语言的移位运算符

C++语言的移位运算符: <<, >>共2种.
int _tmain(int argc, _TCHAR* argv[])

{

/*

* 移位运算符最好只对整数类型运算,这样才有意义

*/

//有(无)符号数,
左移(<<),最高位符号位都将被右边的位覆盖

char num =(char)0x8F;

num<<= 1;

printf("0x8F<< 1 = 0x%02X\n", num);

num =(char)0x7F;

num<<= 1;

printf("0x7F<< 1 = 0x%02X\n", num);

//有(无)符号数,
右移(>>),最高位符号位都将保留

num =(char)0x8F;

num>>= 1;

printf("0x8F>> 1 = 0x%02X\n", num);

num =(char)0x7F;

num>>= 1;

printf("0x7F>> 1 = 0x%02X\n", num);

return 0;

}

运算结果,如下:

0x8F << 1 =0x1E
0x7F << 1 = 0xFE
0x8F >> 1 =0xC7
0x7F >> 1 = 0x3F

C#语言的移位运算符

C#语言的移位运算符: <<, >>共2种.
public static void Main(string[] args)
{

/*

* 移位运算符最好只对整数类型运算,这样才有意义

*/

//有(无)符号数,
左移(<<),最高位符号位都将被右边的位覆盖

sbyte sNum= unchecked((sbyte)0x8F);

sNum<<= 1;

Console.WriteLine("0x8F<< 1 = 0x{0,-2:X2}", sNum);

byte usNum= unchecked((byte)0x7F);

usNum<<= 1;

Console.WriteLine("0x7F<< 1 = 0x{0,-2:X2}", usNum);

//有(无)符号数,
右移(>>),最高位符号位都将保留

sNum =unchecked((sbyte)0x8F);

sNum>>= 1;

Console.WriteLine("0x8F>> 1 = 0x{0,-2:X2}", sNum);

usNum =unchecked((byte)0x7F);

usNum>>= 1;

Console.WriteLine("0x7F>> 1 = 0x{0,-2:X2}", usNum);

Console.ReadKey();
}

运算结果,如下(与C++的结果相同):

0x8F << 1 =0x1E
0x7F << 1 = 0xFE
0x8F >> 1 =0xC7
0x7F >> 1 = 0x3F