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The C# Language
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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 The width and fmt are optional During execution, when a format specifier is encountered in the format string, the corresponding argument, as specified by argnum, is substituted and displayed Thus, the position of a format specification within the format string determines where its matching data will be displayed Both width and fmt are optional Therefore, 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:
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February has 28 or 29 days
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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 28 and 29, are displayed within the string Furthermore, notice that the additional values are separated by commas, not + signs Here is a variation of the preceding statement that specifies minimum field widths:
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ConsoleWriteLine("February has {0,10} or {1,5} days", 28, 29);
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It produces the following output:
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February has 28 or 29 days
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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 Of course, the arguments associated with a format command need not be constants For example, this program displays a table of squares and cubes It uses format commands to output the values
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// Use format commands using System; class DisplayOptions { static void Main() { int i; ConsoleWriteLine("Value\tSquared\tCubed"); for(i = 1; i < 10; i++) ConsoleWriteLine("{0}\t{1}\t{2}", i, i*i, i*i*i); } }
The output is shown here:
3:
D a t a Ty p e s , L i t e r a l s , a n d Va r i a b l e s
Value 1 2 3 4 5 6 7 8 9
Squared 1 4 9 16 25 36 49 64 81
Cubed 1 8 27 64 125 216 343 512 729
PART I
In the preceding examples, no formatting was applied to the values themselves Of course, the purpose 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 You can also specify the decimal point and commas For example, 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 Here is another example This statement
ConsoleWriteLine("{0:###,#####}", 12345656);
generates this output:
123,45656
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
The C format can be used to improve the output from the price discount program shown earlier:
// Use the C format specifier to output dollars and cents using System;
Part I:
The C# Language
class UseDecimal { static void Main() { decimal price; decimal discount; decimal discounted_price; // Compute discounted price price = 1995m; discount = 015m; // discount rate is 15% discounted_price = price - ( price * discount); ConsoleWriteLine("Discounted price: {0:C}", discounted_price); } }
Here is the way the output now looks:
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