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Notice that the increment portion of the for definition is blank This means that each time the loop repeats, x is tested to see if it equals 123, but no further action takes place If you type 123 at the keyboard, however, the loop condition becomes false and the loop terminates The initialization of the loop control variable can occur outside the for statement This most frequently happens when the initial condition of the loop control variable must be computed by some complicated means, as in this example:

gets(s); /* read a string into s */ if(*s) x = strlen(s); /* get the string's length */ else x = 10; for( ; x < 10; ) { printf("%d", x); ++x; }

This very simple change causes the application to display as is shown in figure 17.5. Of course, the AlternatingBackColor and RowHeaderWidth properties are available in the DataGrid class and can be set explicitly for this class. Assigning them in a table style uses these properties only when a matching table name is displayed, in this case a PhotoAlbum object. Note that our choice of light gray may not work very well with some user s desktop colors. You can use an alternate color if you prefer, or a system color such as SystemColors.ControlLight. In your own applications, make sure you carefully select DATA GRID CUSTOMIZATION 575

G-16

One of the most interesting uses of the for loop is to create an infinite loop Since none of the three expressions that form the for loop are required, you can make an endless loop by leaving the conditional expression empty, as here:

color choices for settings such as this, and use system settings where possible. Hardcoding a specific color such as we do here is not typically recommended, since different users may configure their desktops to appear using different sets of conflicting colors.

3:

When the conditional expression is absent, it is assumed to be true You may have an initialization and increment expression, but C programmers more commonly use the for(;;) construct to signify an infinite loop Actually, the for(;;) construct does not guarantee an infinite loop, because a break statement, encountered anywhere inside the body of a loop, causes immediate termination (break is discussed later in this chapter) Program control then resumes at the code following the loop, as shown here:

Figure 17.5 This figure shows an alternating background color of light gray to present a ledger-like appearance.

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ch = '\0'; for( ; ; ) { ch = getchar(); /* get a character */ if(ch == 'A') break; /* exit the loop */ } printf("you typed an A");

Note that the assignment of the MappingName is critical here. Using a name other than PhotoAlbum would have no effect on our table since the name of the table would not match the mapping name of the table style. Of course, our table still uses the default set of columns since we have not yet assigned any column styles to the GridColumnStyles property. Customizing the columns in our table is our next topic. 17.2.2 CUSTOMIZING COLUMN STYLES Now that we know how to customize the properties of a table, let s look at how to customize the columns that appear in the table. The DataGridColumnStyle class is used for this purpose, and is summarized in .NET Table 17.3. This is an abstract class from which various types of columns are derived. The .NET Framework currently provides classes to represent boolean and text columns, namely the DataGridBoolColumn and DataGridTextBoxColumn classes.

A statement may be empty This means that the body of the for loop (or any other loop) may also be empty You can use this fact to simplify the coding of certain algorithms and to create time delay loops Removing spaces from an input stream is a common programming task For example, a database program may allow a query such as show all balances less than 400 The database needs to have each word fed to it separately, without leading spaces That is, the database input processor recognizes show but not show as a command The following loop shows one way to accomplish this It advances past leading spaces in the string pointed to by str: