CHAPTER $3$ PROGRAMMING PROJECTS

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 button. The output should give the type of arithmetic performed and the result. See Fig. $3\mathrm{.}18.$ Note: If one of the numbers in an input text box is changed, the output text box should be cleared.

FIGURE $3\mathrm{.}18$ Possible outcome of Programming Project $1.$

FIGURE $3\mathrm{.}19$ Possible outcome of Programming Project $2.$

Suppose automobile repair customers are billed at the rate of $$35$ per hour for labor. Also, suppose costs for parts and supplies are subject to a $5\%$ sales tax. Write a program to display 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 button is clicked, the customer's name and the three costs should be displayed in a list box, as shown in Fig. $3\mathrm{.}19.$

W$/$rite a program to make change for an amount of money from $0$ through $99$ cents input by the user. The output of the program should show the number of coins from each denomination used to make change. See Fig. $3\mathrm{.}20.$

FIGURE $3\mathrm{.}20$ Possible outcome of Programming Project $3.$

FIGURE $3\mathrm{.}21$ Possible outcome of Programming Project $4.$

Write a program to convert a U$.$S$.$ Customary System length in miles, yards, feet, and inches to a Metric System length in kilometers, meters, and centimeters. A sample run is shown in Fig. $3\mathrm{.}21.$ After the numbers of miles, yards, feet, and inches are read from the text boxes, the length should be converted entirely to inches and then divided by $39\mathrm{.}37$ to obtain the value in meters. The Int function should be used to break the total number of

Programming Projects

$101$

meters into a whole number of kilometers and meters. The number of centimeters should be displayed to one decimal place. The needed formulas are as follows:

total inches $=63360**$ miles $+36**$ yards $+12**$ feet $+$ inches

total meters $=$ total inches $\frac{?}{39\mathrm{.}37}$

kilometers$\frac{}{\text{I}}=nt($ meters $\frac{?}{1000})$