Logical (Bitwise) Operators Operator Operation Operand Types Result Type Example not bitwise negation integer integer not X and bitwise and integer integer X and Y or bitwise or integer integer X or Y xor bitwise xor integer integer X xor Y shl bitwise shift left integer integer X shl 2 shr bitwise shift right integer integer Y shr I The following rules apply to bitwise operators. • The result of a not operation is of the same type as the operand. • If the operands of an and, or, or xor operation are both integers, the result is of the predefined integer type with the smallest range that includes all possible values of both types. • The operations x shl y and x shr y shift the value of x to the left or right by y bits, which (if x is an unsigned integer) is equivalent to multiplying or dividing x by 2^y; the result is of the same type as x. For example, if N stores the value 01101 (decimal 13), then N sh 1 returns 11010 (decimal 26). Note that the value of y is interpreted modulo the size of the type of x. Thus for example, if x is an integer, x shl 40 is interpreted as x shl 8 because an integer is 32 bits and 40 mod 32 is 8.
2进制表示: 10 shr 1 = 1
Logical (Bitwise) Operators
Operator Operation Operand Types Result Type Example
not bitwise negation integer integer not X
and bitwise and integer integer X and Y
or bitwise or integer integer X or Y
xor bitwise xor integer integer X xor Y
shl bitwise shift left integer integer X shl 2
shr bitwise shift right integer integer Y shr I
The following rules apply to bitwise operators.
• The result of a not operation is of the same type as the operand.
• If the operands of an and, or, or xor operation are both integers, the result is of the predefined integer type with the smallest range that includes all possible values of both types.
• The operations x shl y and x shr y shift the value of x to the left or right by y bits, which (if x is an unsigned integer) is equivalent to multiplying or dividing x by 2^y; the result is of the same type as x. For example, if N stores the value 01101 (decimal 13), then N sh 1 returns 11010 (decimal 26). Note that the value of y is interpreted modulo the size of the type of x. Thus for example, if x is an integer, x shl 40 is interpreted as x shl 8 because an integer is 32 bits and 40 mod 32 is 8.