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EXPRESSIONS AND OPERATORS
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The following are some examples: bool bVal; bVal = (1 == 1) && (2 == 2); bVal = (1 == 1) && (1 == 2); bVal = (1 == 1) || (2 == 2); bVal = (1 == 1) || (1 == 2); bVal = (1 == 2) || (2 == 3); bVal = true; bVal = !bVal; // True, both operand expressions are true // False, second operand expression is false // True, both operand expressions are true // True, first operand expression is true // False, both operand expressions are false // Set bVal to true. // bVal is now false.
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The conditional logical operators operate in short-circuit mode, meaning that, if after evaluating Expr1 the result can already be determined, then it skips the evaluation of Expr2. The following code shows examples of expressions in which the value can be determined after evaluating the first operand: bool bVal; bVal = (1 == 2) && (2 == 2); bVal = (1 == 1) || (1 == 2); // False, after evaluating first expression // True, after evaluating first expression
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Because of the short circuit behavior, do not place expressions with side effects (such as changing a value) in Expr2, since they might not be evaluated. In the following code, the post-increment of variable iVal would not be executed, because after executing the first subexpression, it can be determined that the value of the entire expression is false. bool bVal; int iVal = 10; bVal = (1 == 2) && (9 == iVal++); False Never evaluated // result: bVal = False, iVal = 10
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EXPRESSIONS AND OPERATORS
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Logical Operators
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The bitwise logical operators are often used to set the bit patterns for parameters to methods. Table 8-12 lists the bitwise logical operators. These operators, except for bitwise negation, are binary and left-associative. The bitwise negation operator is unary. Table 8-12. The Logical Operators
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Operator
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Bitwise AND
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Description
Produces the bitwise AND of the two operands. The resulting bit is 1 only if both operand bits are 1. Produces the bitwise OR of the two operands. The resulting bit is 1 if either operand bit is 1. Produces the bitwise XOR of the two operands. The resulting bit is 1 only if one, but not both, operand bits are 1. Each bit in the operand is switched to its opposite. This produces the one s complement of the operand.
Bitwise OR
Bitwise XOR
Bitwise negation
The binary bitwise operators compare the corresponding bits at each position in each of their two operands, and they set the bit in the return value according to the logical operation.
EXPRESSIONS AND OPERATORS
Figure 8-5 shows four examples of the bitwise logical operations.
Figure 8-5. Examples of bitwise logical operators The following code implements the preceding examples: const byte x = 12, y = 10; sbyte a; a a a a = = = = x & y; x | y; x ^ y; ~x; // // // // a a a a = = = = 8 14 6 -13
EXPRESSIONS AND OPERATORS
Shift Operators
The bitwise shift operators shift the bit pattern either right or left a specified number of positions, with the vacated bits filled with 0s or 1s. Table 8-13 lists the shift operators. The shift operators are binary and left-associative. The syntax of the bitwise shift operators is shown here. The number of positions to shift is given by Count. Operand << Count Operand >> Count Table 8-13. The Shift Operators // Left shift // Right shift
Operator
Name
Left shift
Description
Shifts the bit pattern left by the given number of positions. The bits shifted off the left end are lost. Bit positions opening up on the right are filled with 0s. Shifts the bit pattern right by the given number of positions. Bits shifted off the right end are lost.
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