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C# 30: A Beginner s Guide
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Before continuing our examination of data types and operators, a small digression will be useful Up to this point, when outputting lists of data, you have been separating each part of the list with a plus sign, as shown here:
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ConsoleWriteLine("You ordered " + 2 + " items at $" + 3 + " each");
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Although very convenient, outputting numeric information in this way does not give you any control over how that information appears For example, for a floating-point value, you can t control the number of decimal places displayed Consider the following statement:
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ConsoleWriteLine("Here is 10/3: " + 100/30);
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It generates this output:
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Here is 10/3: 333333333333333
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While this might be fine for some purposes, displaying so many decimal places could be inappropriate for others For example, in financial calculations, you will usually want to display two decimal places To control how numeric data is formatted, you will need to use a second form of WriteLine( ), shown here, which allows you to embed formatting information: WriteLine( format string , arg0, arg1, , argN) In this version, the arguments to WriteLine( ) are separated by commas and not plus signs The format string contains two items: regular, printing characters that are displayed as-is and format specifiers Format specifiers take this general form: {argnum, width: fmt} Here, argnum specifies the number of the argument (starting from zero) to display The minimum width of the field is specified by width, and the format is specified by fmt During execution, when a format specifier is encountered in the format string, the corresponding argument, as specified by argnum, is substituted and displayed Thus, it is the position of a format specification within the format string that determines where its matching data will be displayed Both width and fmt are optional Thus, in its simplest form, a format specifier simply indicates which argument to display For example, {0} indicates arg0, {1} specifies arg1, and so on Let s begin with a simple example The statement
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ConsoleWriteLine("February has {0} or {1} days", 28, 29);
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produces the following output:
February has 28 or 29 days
As you can see, the value 28 is substituted for {0}, and 29 is substituted for {1} Thus, the format specifiers identify the location at which the subsequent arguments in this case,
2:
Introducing Data Types and Operators
28 and 29 are displayed within the string Furthermore, notice that the additional values are separated by commas, not plus signs Here is a variation of the preceding statement that specifies minimum field widths:
ConsoleWriteLine("February has {0,10} or {1,5} days", 28, 29);
It produces the following output:
February has 28 or 29 days
As you can see, spaces have been added to fill out the unused portions of the fields Remember, a minimum field width is just that: the minimum width Output can exceed that width if needed In the preceding examples, no formatting was applied to the values themselves Of course, the value of using format specifiers is to control the way the data looks The types of data most commonly formatted are floating-point and decimal values One of the easiest ways to specify a format is to describe a template that WriteLine( ) will use To do this, show an example of the format that you want, using #s to mark the digit positions For instance, here is a better way to display 10 divided by 3:
ConsoleWriteLine("Here is 10/3: {0:###}", 100/30);
The output from this statement is shown here:
Here is 10/3: 333
In this example, the template is ###, which tells WriteLine( ) to display two decimal places It is important to understand, however, that WriteLine( ) will display more than one digit to the left of the decimal point if necessary so as not to misrepresent the value If you want to display monetary values, use the C format specifier For example,
decimal balance; balance = 1232309m; ConsoleWriteLine("Current balance is {0:C}", balance);
The output from this sequence is shown here (in US dollar format):
Current balance is $12,32309
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