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The empty brackets indicate that the array is of undetermined length You can now access the individual arguments by indexing argv For example, argv[0] points to the first string, which is always the program s name; argv[1] points to the next string, and so on Another short example using command line arguments is the program called countdown, shown here It counts down from a starting value (which is specified on the command line) and beeps when it reaches 0 Notice that the first argument containing the starting number is converted into an integer using the standard function atoi( ) If the string display is the second command line argument, the countdown will also be displayed on the screen

This would work, but it means that a bunch of the buttons would be hardcoded instead of based on a style. Instead, we could derive the style for the operators from the generic style:

/* Countdown program */ #include <stdioh> #include <stdlibh> #include <stringh> int main(int argc, char *argv[]) { int disp, count; if(argc<2) { printf("You must enter the length of the count\n"); printf("on the command line Try again\n"); exit(1); } if(argc==3 && !strcmp(argv[2],"display")) disp = 1; else disp = 0;

for(count=atoi(argv[1]); count; --count) if(disp) printf("%d\n", count); putchar('\a'); /* this will ring the bell */ printf("Done"); return 0; }

The certification program is extending to testing Traffic Management (MEF 101) according to the definitions in MEF 7

<Style x:Key="OperatorButtonStyle" BasedOn="{StaticResource {x:Type Button}}" TargetType="Button"> <Setter Property="BorderBrush" Value="Green"/> <Setter Property="FontWeight" Value="UltraBold"/> </Style>

Notice that if no command line arguments have been specified, an instructional message is printed A program with command line arguments often issues instructions if the user attempts to run the program without entering the proper information To access an individual character in one of the command line arguments, add a second index to argv For example, the next program displays all the arguments with which it was called, one character at a time:

#include <stdioh> int main(int argc, char *argv[]) { int t, i; for(t=0; t<argc; ++t) { i = 0; while(argv[t][i]) { printf("%c", argv[t][i]); ++i; } printf(" "); } return 0; }

Notice the use of the implicit name for the automatic button style. Now, we can make the operator buttons use this style. Here s the XAML for a digit button and for an operator button:

Remember, for argv, the first index accesses the string and the second index accesses the individual characters of the string You generally use argc and argv to get initial commands, which are needed at start-up, into your program The command line arguments often specify a filename, an option, or an alternate behavior, for example Using command line arguments gives your program a professional appearance and facilitates its use in batch files If you link the file WILDARGSOBJ (provided with C++ Builder) with your program, command line arguments like *EXE automatically expand into any matching filenames (C++ Builder automatically processes the wildcard filename characters and increases the value of argc appropriately) For example, if you link the following

2

4:

<Button Grid.Column="0" Grid.Row="3" Name="button4">4</Button> <Button Grid.Column="0" Grid.Row="3" Style="{StaticResource OperatorButtonStyle}" Name="buttonTimes">X</ Button>

program with WILDARGSOBJ, it shows you how many files match the filename specified on the command line:

First 16 Vendors, 39 Products First 7 Carriers Certified to & 21 Services MEF 9 (UNI) Certified to Announced MEF 9 (UNI) Announced

/* Link this program with WILDARGSOBJ */ #include <stdioh> int main(int argc, char *argv[]) { register int i; printf("%d files match specified name\n", argc-1); printf("They are: "); for(i=1; i<argc; i++) printf("%s ", argv[i]); return 0; }

Notice that button4 doesn t reference a style at all. It s automatically using the implicit button style without having to do anything. For the operators, though, we have to explicitly use the OperatorButtonStyle. Because an object can only have one style at a time, the buttonTimes uses the operator style, overriding the implicit style. This approach is better still at least we only have to provide styles for 5 of the 16 buttons. This is one of those cases where it might be better to explicitly use a style for every button. Implicit styles work better when there s a generic look-and-feel always implied. When there are divergent styles for similar items, explicit references are generally better. Speaking of which, you can do more with styles than setting a few properties. You can also override the control s template to completely change the look-and-feel of a control.

If you call this program WA, then executing it in the following manner tells you the number of files that have the EXE extension, and lists their names: