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CHAPTER 9 STATEMENTS
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Scope of Variables in a for Statement
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Any variables declared in the initializer are visible only within the for statement. This is different than C and C++. The following example illustrates this point: Type is needed here for declaration for( int i=0; i<10; i++ ) // Variable i is in scope here, and also Statement; // here within the statement. // Here, after the statement, i no longer exists. Type is needed here again because previous variable has gone out of existence for( int i=0; i<10; i++ ) // We need to define a new variable i here, since Statement; // the previous one has gone out of existence. The local variables declared within the body of the loop are known only within the loop.
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Note Unlike C and C++, the scope of variables declared in the initializer lasts only for the length of
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the loop.
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CHAPTER 9 STATEMENTS
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Multiple Expressions in the Initializer and Iterator
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Both the initializer and the iterator can contain multiple expressions as long as they are separated by commas. For example, the following code has two variable declarations in the initializer and two expressions in the iterator: static void Main( ) { const int MaxI = 5; Two declarations Two expressions for (int i = 0, j = 10; i < MaxI; i++, j += 10) { Console.WriteLine("{0}, {1}", i, j); } } The output from this code is the following: 0, 1, 2, 3, 4, 10 20 30 40 50
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CHAPTER 9 STATEMENTS
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Jump Statements
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When the flow of control reaches jump statements, program execution is unconditionally transferred to another part of the program. The jump statements are the following: break continue return goto throw This chapter covers the first four of these statements. The throw statement is discussed in 11.
The break Statement
You have already seen the break statement earlier in this chapter used in the switch statement. But it can also be used in the following statement types as well: for foreach while do switch In the body of one of these statements, break causes execution to exit the innermost enclosing statement. For example, the following while loop would be an infinite loop if it relied only on its test expression, which is always true. But instead, after three iterations of the loop, the break statement is encountered and the loop is exited. int x = 0; while( true ) { x++; if( x >= 3 ) break; }
CHAPTER 9 STATEMENTS
The continue Statement
The continue statement causes program execution to go to the top of the innermost enclosing loop of the following types: while do for foreach For example, the following for loop is executed five times. In the first three iterations, it encounters the continue statement and goes directly back to the top of the loop, missing the WriteLine statement at the bottom of the loop. Execution only reaches the WriteLine statement during the last two iterations. for( int x=0; x<5; x++ ) { if( x < 3 ) continue; // Execute loop five times // The first three times // Go directly back to the top of loop.
// This line is only reached when x is 3 or greater. Console.WriteLine("Value of x is {0}", x); } The output of this code is the following: Value of x is 3 Value of x is 4 The following code shows an example of a continue statement in a while loop. This code has the same output as the preceding for loop example. int x = 0; while( x < 5 ) { if( x < 3 ) { x++; continue; }
// Go back to top of loop
// This line is reached only when x is 3 or greater. Console.WriteLine("Value of x is {0}", x); x++; }
CHAPTER 9 STATEMENTS
Labeled Statements
A labeled statement consists of an identifier, followed by a colon, followed by a statement. It has the following form: Identifier: Statement A labeled statement is executed exactly as if the label were not there and consisted of just the Statement part. Adding a label to a statement allows control to be transferred to the statement from another part of the code. Labeled statements are only allowed inside blocks.
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