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// This displays the current value of width ConsoleWriteLine("width contains " + width); // Assign to area the product of length and width area = length * width; Multiply length by width
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// Display the result ConsoleWrite("area contains length * width: "); ConsoleWriteLine(area); } }
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length contains 9 width contains 7 area contains length * width: 63
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This program introduces several new concepts First, the statement
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int length; // this declares a variable
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declares a variable called length 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, length can hold integer values These are
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1: C# Fundamentals
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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 length of type int The next two lines declare two more int variables, called width and area:
int width; int area; // this declares another variable // this is a third variable
Notice that each 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, such as double, char, and string The following line of code assigns length the value 9:
length = 9;
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 length preceded by the string length contains
ConsoleWriteLine("length contains " + length);
In this statement, the plus sign causes the value of length 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 Next, the value of width is set to 7 and displayed, using the same type of statements just described Then, the following line of code assigns area the value of length times width
area = length * width;
This line multiplies the value in length (which is 9) by the value in width (which is 7), and then stores that result in area Thus, after the line executes, area will contain the value 63 The values of length and width will be unchanged Like most other computer languages, C# supports a complete set of arithmetic operators, including those shown here:
+ * / Addition Subtraction Multiplication Division
These can be used with any type of numeric data
C# 30: A Beginner s Guide
Ask the Expert
Q: A:
You say that all variables must be declared before they are used, and that all variables have a type However, you mention that C# 30 includes a new feature called an implicitly typed variable What is this, and does it circumvent the need to declare variables As you will learn in 2, implicitly typed variables are variables whose type is automatically determined by the compiler Understand, however, that an implicitly typed variable still needs to be declared Instead of using a type name, such as int, an implicitly typed variable is declared using the var keyword Implicitly typed variables are very useful in several specialized situations (especially those involving LINQ), but they are not intended to replace explicitly typed variables in general Normally, when you declare a variable, you give it an explicit type
Here are the next two lines in the program:
ConsoleWrite("area contains length * width: "); ConsoleWriteLine(area);
Two new things are occurring here First, the built-in method Write( ) is used to display the string area contains length * width: 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 area 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, length and width could have been declared like this:
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