Enter the three Option statements in the Code Editor window.

One of the buttons in the interface should calculate and display the percentage of students receiving a grade of P (for Pass) and the percentage of students receiving a grade of F (for Fail). Code the buttons Click event procedure using variables.

Use Integer variables for the numbers of P and F grades. Use Double variables for the percentages.

Display the percentages with a percent sign and one decimal place. Save the solution and then start and test the application.

(When testing the application with invalid data, the percentages may display as NaN, which stands for Not a Number. The message is a result of dividing a number by 0. In Chapter 4, you will learn how to use a selection structure to prevent this error message.)

1. Now professionalize your interface by coding each text boxs TextChanged and Enter event procedures. Save the solution and then start and test the application.

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