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PART I
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is zero");
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is two");
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Part I:
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The C# Language
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case 4: ConsoleWriteLine("i is four"); break; default: ConsoleWriteLine("i is five or more"); break; } } }
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The output produced by this program is shown here:
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i i i i i i i i i i is is is is is is is is is is zero one two three four five or five or five or five or five or
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As you can see, each time through the loop, the statements associated with the case constant that matches i are executed All others are bypassed When i is five or greater, no case constants match, so the default is executed In the preceding example, the switch was controlled by an int variable As explained, you can control a switch with any integer type, including char Here is an example that uses a char expression and char case constants:
// Use a char to control the switch using System; class SwitchDemo2 { static void Main() { char ch; for(ch='A'; ch<= 'E'; ch++) switch(ch) { case 'A': ConsoleWriteLine("ch break; case 'B': ConsoleWriteLine("ch break; case 'C': ConsoleWriteLine("ch break; case 'D': ConsoleWriteLine("ch break; case 'E': ConsoleWriteLine("ch
is A");
is B");
is C");
is D");
is E");
5:
Program Control Statements
break; } }
PART I
The output from this program is shown here:
ch ch ch ch ch is is is is is A B C D E
Notice that this example does not include a default case Remember, the default is optional When not needed, it can be left out In C#, it is an error for the statement sequence associated with one case to continue on into the next case This is called the no fall-through rule This is why case sequences end with a break statement (You can avoid fall-through in other ways, such as by using the goto discussed later in this chapter, but break is by far the most commonly used approach) When encountered within the statement sequence of a case, the break statement causes program flow to exit from the entire switch statement and resume at the next statement outside the switch The default sequence also must not fall through, and it too usually ends with break The no fall-through rule is one point on which C# differs from C, C++, and Java In those languages, one case may continue on (that is, fall through) into the next case There are two reasons that C# instituted the no fall-through rule for cases: First, it allows the compiler to freely rearrange the order of the case sequences, perhaps for purposes of optimization Such a rearrangement would not be possible if one case could flow into the next Second, requiring each case to explicitly end prevents a programmer from accidentally allowing one case to flow into the next Although you cannot allow one case sequence to fall through into another, you can have two or more case labels refer to the same code sequence, as shown in this example:
// Empty cases can fall through using System; class EmptyCasesCanFall { static void Main() { int i; for(i=1; i < 5; i++) switch(i) { case 1: case 2: case 3: ConsoleWriteLine("i is 1, 2 or 3"); break; case 4: ConsoleWriteLine("i is 4"); break; } } }
Part I:
The C# Language
The output is shown here:
i i i i is is is is 1, 2 or 3 1, 2 or 3 1, 2 or 3 4
In this example, if i has the value 1, 2, or 3, then the first WriteLine( ) statement executes If i is 4, then the second WriteLine( ) statement executes The stacking of cases does not violate the no fall-through rule, because the case statements all use the same statement sequence Stacking case labels is a commonly employed technique when several cases share common code This technique prevents the unnecessary duplication of code sequences
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