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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

Note A block counts syntactically as a single embedded statement. Anywhere that an embedded statement is required syntactically, you can use a block.

Ultimately, the deepest idiosyncrasies of languages have less impact on speed than the many factors of the system design.

Notice how you can interact with the top-level dialog over each frame, but not the frame under either of them when the dialog is shown. Figure 4-11 shows the initial pair of frames. Figure 4-12 shows the two frames with their respective option panes showing. Changing the setModalityType() line to use APPLICATION_MODAL and rerunning the program won t allow you to interact with both option frames simultaneously. You need to finish using one before you can bring up the other.

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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;

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.

Note Changing the modality of a window that s already showing has no effect. You must hide the dialog

The philosophy of simplicity extends to the selection of third-party utilities (toolkits and frameworks). They are integral to function-oriented software, because its inherent swapability makes toolkits and frameworks easier to both use and change at will (than with application-oriented software), so they are abundant parts of these systems. This is possible with standardized interfaces and standardized functionality. But it s crucial to hold as a guide that any utilities are better when they are less invasive to the software that is using them. This means that they shouldn t force significant changes functional contortions to that software; they should strive to allow transparency. So, the philosophy of simplicity extends to the standards as well. It also points out that any designing must take into account

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