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PART I
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When you run this program, you will see the following output:
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x contains 100 y contains x / 2: 50
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This program introduces several new concepts First, the statement
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int x; // this declares a variable
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declares a variable called x of type integer In C#, all variables must be declared before they are used Further, the kind of values that the variable can hold must also be specified This is called the type of the variable In this case, x can hold integer values These are whole numbers In C#, to declare a variable to be of type integer, precede its name with the keyword int Thus, the preceding statement declares a variable called x of type int The next line declares a second variable called y
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int y; // this declares another variable
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Notice that it uses the same format as the first except that the name of the variable is different In general, to declare a variable, you will use a statement like this: type var-name; Here, type specifies the type of variable being declared, and var-name is the name of the variable In addition to int, C# supports several other data types The following line of code assigns x the value 100:
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x = 100; // this assigns 100 to x
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In C#, the assignment operator is the single equal sign It copies the value on its right side into the variable on its left The next line of code outputs the value of x preceded by the string x contains
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ConsoleWriteLine("x contains " + x);
In this statement, the plus sign causes the value of x to be displayed after the string that precedes it This approach can be generalized Using the + operator, you can chain together as many items as you want within a single WriteLine( ) statement The next line of code assigns y the value of x divided by 2:
y = x / 2;
This line divides the value in x by 2 and then stores that result in y Thus, after the line executes, y will contain the value 50 The value of x will be unchanged Like most other
Part I:
The C# Language
computer languages, C# supports a full range of arithmetic operators, including those shown here:
+ * / Addition Subtraction Multiplication Division
Here are the next two lines in the program:
ConsoleWrite("y contains x / 2: "); ConsoleWriteLine(y);
Two new things are occurring here First, the built-in method Write( ) is used to display the string y contains x / 2: This string is not followed by a new line This means that when the next output is generated, it will start on the same line The Write( ) method is just like WriteLine( ), except that it does not output a new line after each call Second, in the call to WriteLine( ), notice that y is used by itself Both Write( ) and WriteLine( ) can be used to output values of any of C# s built-in types One more point about declaring variables before we move on: It is possible to declare two or more variables using the same declaration statement Just separate their names by commas For example, x and y could have been declared like this:
int x, y; // both declared using one statement
NOTE C# includes a feature called an implicitly typed variable Implicitly typed variables are
variables whose type is automatically determined by the compiler Implicitly typed variables are discussed in 3
Another Data Type
In the preceding program, a variable of type int was used However, an int variable can hold only whole numbers It cannot be used when a fractional component is required For example, an int variable can hold the value 18, but not the value 183 Fortunately, int is only one of several data types defined by C# To allow numbers with fractional components, C# defines two floating-point types: float and double, which represent single- and doubleprecision values, respectively Of the two, double is the most commonly used To declare a variable of type double, use a statement similar to that shown here:
double result;
Here, result is the name of the variable, which is of type double Because result has a floating-point type, it can hold values such as 12223, 0034, or 190 To better understand the difference between int and double, try the following program:
/* This program illustrates the differences between int and double */
2:
An Overview of C#
using System; class Example3 { static void Main() { int ivar; // this declares an int variable double dvar; // this declares a floating-point variable ivar = 100; // assign ivar the value 100
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