15. ビット演算

Java

15. ビット演算

論理シフトと算術シフト

lesson 037

class Lesson037 {
    public static void main(String args[]) {
        int count,b_shift;

        b_shift = 1;
        for (count = 0 ; count <= 32 ; count++) {
            System.out.println(b_shift);
            b_shift <<= 1;
        }

        b_shift = -2147483648;
        for (count = 0 ; count <= 32 ; count++) {
            System.out.println(b_shift);
            b_shift >>= 1;
        }

        b_shift = -2147483648;
        for (count = 0 ; count <= 32 ; count++) {
            System.out.println(b_shift);
            b_shift >>>= 1;
        }
    }
}

実行結果


L:\>java Lesson037

1

2

4

8

16

32

64

128

256

512

1024

2048

4096

8192

16384

32768

65536

131072

262144

524288

1048576

2097152

4194304

8388608

16777216

33554432

67108864

134217728

268435456

536870912

1073741824

-2147483648

0

-2147483648

-1073741824

-536870912

-268435456

-134217728

-67108864

-33554432

-16777216

-8388608

-4194304

-2097152

-1048576

-524288

-262144

-131072

-65536

-32768

-16384

-8192

-4096

-2048

-1024

-512

-256

-128

-64

-32

-16

-8

-4

-2

-1

-1

-2147483648

1073741824

536870912

268435456

134217728

67108864

33554432

16777216

8388608

4194304

2097152

1048576

524288

262144

131072

65536

32768

16384

8192

4096

2048

1024

512

256

128

64

32

16

8

4

2

1

0