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This code causes the value of oldValue to be placed in newValue, and then oldValue is incremented If oldValue contained 41, newValue would also be 41, and then oldValue would be incremented to 42 Now look at the code written with a prefix operator:
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newValue = ++oldValue;
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In this case, oldValue is incremented and then assigned to newValue Given the same initial value of oldValue, 41, this expression causes oldValue to be incremented to 42 and then assigned to newValue
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Statements and Expressions
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This will be a very brief overview of statements and expressions in the C# programming language We assume, again, that you have experience with another programming language and that this section is just a review for you If this is not true, we suggest you become very familiar with these concepts the Microsoft exams will assume that you are proficient in them
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Statements
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A statement is something that ends with a semicolon (;) or is enclosed in a block ({ }) A very common statement is the assignment statement:
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numberOfHours = regularHours + overTimeHours;
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Any amount of whitespace can be found in a statement unless it is in an identifier Sometimes it is easier to split a statement over many lines of code, since a very long statement can be hard to read and can span more than a single displayed line The following is a short list of statement types: Blocks Labels Declarations Expressions Flow control (which will be covered in the next section) In the remainder of this section, we will briefly explore each one of these statement types NOTE Leave out a semicolon, and the compiler will complain with very odd error messages A good debugging practice is to automatically check for missing semicolons
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Blocks A block is a section of code (or a statement) that begins with an opening brace bracket ({) and completes with a closing brace bracket (}) By placing code within
2: Variables and Program Structure
a block, you are asking that the code be treated as if it were a single unit So far, we have seen blocks that represent classes and method groupings You can also use a block to group together code based on a certain condition, like this:
if ( x > 42) { y = 12; SystemConsoleWriteLine ("The value of x is greater than 42"); }
PART I
The only way that the code within the brace brackets gets executed is if the value of x is greater than 42 Blocks are required in order to mark the boundaries of certain structures and statements Labels Labels are used to name a position in the program The labels can be any legal identifier closed with a colon (:) Here are two examples of labels:
finished: label1:
Declarations A declaration is used to declare the existence of and the type of variables You can simply declare a variable, like this:
int MyInteger;
Or you can declare and initialize a variable:
int MyInteger = 10;
The declaration type can be any predefined C# type, or it can be a user-defined type Expressions the following:
x > 12;
An expression is anything that can be computed or evaluated, such as
This expression returns a Boolean true if x is indeed greater than 12, and returns a false if x is equal to or less than 12 Expressions include the full range of statements and operators as already discussed in this chapter Another type of expression that has not been covered so far is the enumeration expression Consider the following code:
public enum MonthsOfTheYear { Jan=01, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec }
By coding this expression, you are creating a new type called MonthsOfTheYear, which can be used in a more intuitive way than by simply using the numerical values Essentially, it is a user-defined integer type When we code MonthsOfTheYearJan, the compiler will consider this equal to 01 The compiler will assign values to the
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