Computer Programming Concepts and Visual Basic David I. Schneider

68 Computer Programming Concepts and Visual Basic
12. Functions can be thought of as accepting numbers or strings as input and
returning numbers or strings as output.
Function Input Output
Asc string number
Chr number string
InStr string, string number
Int number number
LCase string string
Left string, number string
Len string number
Mid string, number, number string
Right string,, number string
Rnd number
Round number, number number
Sqr number number
Str number string
Trim string string
UCase string string
Val string number
PROGRAMMING PROJECTS
1. Write a program that allows the user to specify two numbers and then adds, subtracts,
or multiplies them when the user clicks on the appropriate command button.
The output should give the type of arithmetic performed and the result.
2. Suppose automobile repair customers are billed at the rate of $35 per hour for
labor. Also, costs for parts and supplies are subject to a 5 percent sales tax.
Write a program to print out a simplified bill. The customer's name, the number
of hours of labor, and the cost of parts and supplies should be entered into
the program via text boxes. When a command button is clicked, the customer's
name (indented) and the three costs should be displayed in a picture box, as
shown in the sample run in Figure 2-31.
FIGURE 2-31 Sample Run for Programming Project 2
3. Write a program to generate the following personalized form letter. The person's
name and address should be read from text boxes.
Mr. John Jones
123 Main Street
Juneau, Alaska 99803
Dear Mr. Jones,