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TABLE 33: Conditional Values for the XOR Operator
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Left Operand
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Right Operand
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Result
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True True False False
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False True True False
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Logical Negation Operator (!) Sometimes called the NOT operator, the logical negation operator, !, inverts a bool data type to its opposite This operator is a unary operator, meaning it requires only one operand Listing 334 demonstrates how it works, and Output 316 shows the results
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Listing 334: Using the Logical Negation Operator
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bool result; bool valid = false; result = !valid; // Displays "result = True" SystemConsoleWriteLine("result = {0}", result);
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OUTPUT 316:
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result = True
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To begin, valid is set to false You then use the negation operator on valid and assign a new value to result
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Conditional Operator ( ) In place of an if-else statement used to select one of two values, you can use the conditional operator The conditional operator is a question mark ( ), and the general format is as follows:
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conditional consequence: alternative;
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The conditional operator is a ternary operator, because it has three operands: conditional, consequence, and alternative If the conditional
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3: Operators and Control Flow
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evaluates to true, then the conditional operator returns consequence Alternatively, if the conditional evaluates to false, then it returns alternative Listing 335 is an example of how to use the conditional operator The full listing of this program appears in Appendix B
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Listing 335: Conditional Operator
public class TicTacToe { public static string Main() { // Initially set the currentPlayer to Player 1; int currentPlayer = 1; // for (int turn = 1; turn <= 10; turn++) { // // Switch players currentPlayer = (currentPlayer == 2) 1 : 2; } } }
The program swaps the current player To do this, it checks whether the current value is 2 This is the conditional portion of the conditional statement If the result is true, then the conditional operator returns the value 1 Otherwise, it returns 2 Unlike an if statement, the result of the conditional operator must be assigned (or passed as a parameter) It cannot appear as an entire statement on its own Use the conditional operator sparingly, because readability is often sacrificed and a simple if/else statement may be more appropriate
Null Coalescing Operator ( ) Starting with C# 20, there is a shortcut to the conditional operator when checking for null The shortcut is the null coalescing operator, and it evaluates an expression for null and returns a second expression if the value is null
expression1 expression2;
Bitwise Operators ( <<, >>, |, &, ^, ~)
If the expression (expression1) is not null, then expression1 is returned In other words, the null coalescing operator returns expression1 directly unless expression1 evaluates to null, in which case expression2 is returned Unlike the conditional operator, the null coalescing operator is a binary operator Listing 336 is an example of how to use the null coalescing operator
Listing 336: Null Coalescing Operator
string fileName; // string fullName = fileName "defaulttxt"; //
In this listing, we use the null coalescing operator to set fullName to defaulttxt if fileName is null If fileName is not null, fullName is simply assigned the value of fileName
Bitwise Operators (<<, >>, |, &, ^, ~)
An additional set of operators that is common to virtually all programming languages is the set of operators for manipulating values in their binary formats: the bit operators
BEGINNER TOPIC Bits and Bytes All values within a computer are represented in a binary format of 1s and 0s, called binary digits (bits) Bits are grouped together in sets of eight, called bytes In a byte, each successive bit corresponds to a value of 2 raised to a power, starting from 20 on the right, to 27 on the left, as shown in Figure 31
0 25
0 24
0 23
0 22
0 21
0 20
27 26
Figure 31: Corresponding Placeholder Values
In many instances, particularly when dealing with low-level or system services, information is retrieved as binary data In order to manipulate these devices and services, you need to perform manipulations of binary data