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Statements
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What Are Statements Expression Statements Flow-of-Control Statements The if Statement The if . . . else Statement The switch Statement The while Loop The do Loop The for Loop Jump Statements The break Statement The continue Statement Labeled Statements The goto Statement The using Statement Other Statements
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CHAPTER 9 STATEMENTS
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The statements in C# are very similar to those of C and C++. This chapter covers the characteristics of a C# statement, as well as the flow-of-control statements provided by the language. A statement is a source code instruction describing a type or telling the program to perform an action. There are three major categories of statements, as follows: Declaration statements: Statements that declare types or variables Embedded statements: Statements that perform actions or manage flow of control Labeled statements: Statements to which control can jump Previous chapters have covered a number of different declaration statements, including declarations of local variables, classes, and class members. This chapter will cover the embedded statements, which do not declare types, variables, or instances. Instead, they use expressions and flow-of-control constructs to work with the objects and variables that have been declared by the declaration statements. A simple statement consists of an expression followed by a semicolon. A block is a sequence of statements enclosed by matching curly braces. The enclosed statements can include the following: Declaration statements Embedded statements Labeled statements Nested blocks The following code gives examples of each: int x = 10; int z; { int y = 20; z = x + y; top: y = 30; ... { ... } } // Simple declaration // Simple declaration // // // // Block Simple declaration Embedded statement Labeled statement
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// Nested block
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Note A block counts syntactically as a single embedded statement. Anywhere that an embedded statement is required syntactically, you can use a block.
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CHAPTER 9 STATEMENTS
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An empty statement consists of just a semicolon. You can use an empty statement at any position where the syntax of the language requires an embedded statement, but your program logic does not require any action. For example, the following code is an example of using the empty statement: The second line in the code is an empty statement. It is required because there must be an embedded statement between the if part and the else part of the construct. The fourth line is a simple statement, as shown by the terminating semicolon. if( x < y ) ; else z = a + b;
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// Empty statement // Simple statement
Expression Statements
The last chapter looked at expressions. Expressions return values, but they can also have side effects. A side effect is an action that affects the state of the program. Many expressions are evaluated only for their side effects. You can create a statement from an expression by placing a statement terminator (semicolon) after it. Any value returned by the expression is discarded. For example, the following code shows an expression statement. It consists of the assignment expression (an assignment operator and two operands) followed by a semicolon. This does the following two things: The expression assigns the value on the right of the operator to the memory location referenced by variable x. Although this is probably the main reason for the statement, this is considered the side effect. After setting the value of x, the expression returns with the new value of x. But there is nothing to receive this return value, so it is ignored. x = 10; The whole reason for evaluating the expression is to achieve the side effect.
CHAPTER 9 STATEMENTS
Flow-of-Control Statements
C# provides the flow-of-control constructs common to modern programming languages. Conditional execution executes or skips a section of code depending on a condition. The conditional execution statements are the following: if if...else switch Looping statements repeatedly execute a section of code. The looping statements are the following: while do for foreach Jump statements change the flow of control from one section of code to a specific statement in another section of code. The jump statements are the following: break continue return goto throw Conditional execution and looping constructs (other than foreach) require a test expression, or condition, to determine where the program should continue execution.
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