Computer Programming Concepts and Visual Basic David I. Schneider

238 Computer Programming Concepts and Visual Basic
TABLE 7.5
Final 1998 American League East Standings
American League East
W L Pct
New York 114 48 .704
Boston 92 70 .568
Toronto 88 74 .543
Baltimore 79 83 .488
Tampa Bay 63 99 .389
3. Write a rudimentary word processing program. The program should do the following:
(a) Use InputBox to request the name of the sequential file to hold the document
being created.
(b) Set the label for a text box to “Enter Line 1” and allow the user to enter the
first line of the document into a text box.
(c) When the Enter key is pressed or a “Record Line” command button is
clicked, determine if the line is acceptable. Blank lines are acceptable input,
but lines exceeding 60 characters in length should not be accepted. Advise
the user of the problem with a message box, and then set the focus back to
the text box so that the user can edit the line to an acceptable length.
(d) When an acceptable line is entered, write this line to the file and display it
in a picture box.
(e) Change the prompt to “Enter Line 2”, clear the text box, allow the user to
enter the second line of the document into the text box, and carry out (c) for
this line using the same picture box. (Determine in advance how many lines
the picture box can display and only clear the picture box when the lines
already displayed do not leave room for a new line.)
(f) Continue as in (d) with appropriate labels for subsequent lines until the user
clicks on a “Finished” command button.
(g) Clear the picture box and display the number of lines written and the name
of the data file created.
4. Write a program that counts the number of times a word occurs in the sequential
file created in Programming Project 3. The file name and word should be
read from text boxes. The search should not be sensitive to the case of the letters.
For instance, opening a file that contained the first three sentences of the
directions to this problem and searching for “the” would produce the output:
“the” occurs six times.
5. Create and Maintain Telephone Directories. Write a program to create and
maintain telephone directories. Each directory will be a separate sequential file.
The following command buttons should be available:
(a) Select a directory to access. A list of directories that have been created
should be stored in a separate sequential file. When a request is made to
open a directory, the list of available directories should be displayed as part
of an InputBox prompt requesting the name of the directory to be accessed.
If the user responds with a directory name not listed, the desire to create a
new directory should be confirmed, and then the new directory created and
added to the list of existing directories.
(b) Add name and phone number (as given in the text boxes) to the end of the
current directory.
(c) Delete name (as given in the text box) from the current directory.
(d) Sort the current directory into name order.