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The C# Language
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Operator Precedence
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Table 4-2 shows the order of precedence for all C# operators, from highest to lowest This table includes several operators that will be discussed later in this book
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Highest () ! * + << < == & ^ | && || : = Lowest op= => [] ~ / >> > != <= >= is as (cast) % ++ (postfix) + (unary) (postfix) (unary) checked ++ (prefix) new (prefix) > sizeof typeof & (address of) unchecked
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TABLE 4-2
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The Precedence of the C# Operators
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CHAPTER
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Program Control Statements
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his chapter discusses C# s program control statements There are three categories of program control statements: selection statements, which are the if and the switch; iteration statements, which consist of the for, while, do-while, and foreach loops; and jump statements, which include break, continue, goto, return, and throw Except for throw, which is part of C# s exception-handling mechanism and is discussed in 13, the others are examined here
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The if Statement
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2 introduced the if statement It is examined in detail here The complete form of the if statement is if(condition) statement; else statement; where the targets of the if and else are single statements The else clause is optional The targets of both the if and else can be blocks of statements The general form of the if using blocks of statements is if(condition) { statement sequence } else { statement sequence } If the conditional expression is true, the target of the if will be executed; otherwise, if it exists, the target of the else will be executed At no time will both of them be executed The conditional expression controlling the if must produce a bool result Here is a simple example that uses an if and else to report if a number is positive or negative:
// Determine if a value is positive or negative using System;
Part I:
The C# Language
class PosNeg { static void Main() { int i; for(i=-5; i <= 5; i++) { ConsoleWrite("Testing " + i + ": "); if(i < 0) ConsoleWriteLine("negative"); else ConsoleWriteLine("positive"); } } }
The output is shown here:
Testing Testing Testing Testing Testing Testing Testing Testing Testing Testing Testing -5: negative -4: negative -3: negative -2: negative -1: negative 0: positive 1: positive 2: positive 3: positive 4: positive 5: positive
In this example, if i is less than zero, then the target of the if is executed Otherwise, the target of the else is executed In no case are both executed
Nested ifs
A nested if is an if statement that is the target of another if or else Nested ifs are very common in programming The main thing to remember about nested ifs in C# is that an else clause always refers to the nearest if statement that is within the same block as the else and not already associated with an else Here is an example:
if(i == 10) { if(j < 20) a = b; if(k > 100) c = d; else a = c; // this else refers to if(k > 100) } else a = d; // this else refers to if(i == 10)
As the comments indicate, the final else is not associated with if(j < 20) because it is not in the same block (even though it is the nearest if without an else) Rather, the final else is associated with if(i == 10) The inner else refers to if(k > 100) because it is the closest if within the same block The following program demonstrates a nested if In the positive/negative program shown earlier, zero is reported as positive However, as a general rule, zero is considered signless The following version of the program reports zero as being neither positive nor negative
5:
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