Provide a brief definition of the following terms (in the interface programming context):

• Boolean
• Condition
• Operator
• Reserved Word
• Subroutine

    Private Sub btnAssign_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAssign.Click
        lblFirst.Text = lblSecond.Text
        lblSecond.Text = lblFirst.Text
    End Sub

Salary Calculator

• Design a form that allows the user to enter the name, hourly wage and number of hour worked for an employee.
• When the button is clicked the program should calculate the weekly salary of the employee and make the text for a check in the textbox below.
• Make sure the user has entered numbers for the hours and the wage. Pop up a messagebox (and exit the subroutine) if the user does not enter a number. 
• If the hourly wage is below Minimum Wage (let's use $7.25), a messagebox should appear indicating the problem.
• If the user enters a negative number for the number of hours, a message box should appear indicating the problem. 
• If the employee worked more than 40 hours, he or she should receive time and a half for the hours exceeding 40. For example if one works 36 hours at $8.00 an hour, one will receive 288 = 36*8 dollars; but if one works 44 hours at $8.00 an hour, one will receive  368 = 40*8 + (44-40)*8*1.5 dollars.
• Clear out the "check" area if the user changes any of the information above.
• The "check" above is a multiline TextBox.
• The date was written using the code Now.Date
• To move to a the beginning of a new line, concatenate the constant VbCrLf (Visual Basic Carriage Return Line Feed) to the string.
• For a tab, use the constant VbTab.
• Suppose Salary is a variable holding an amount of money to be paid to an employee.  You can use the code Format(Salary,"Currency") or the code Salary.toString("c") to print out the number in a way that looks like money.

Write a program that allows a single user to logon.

• The password textbox should display asterisks, which is simply achieved by setting the TextBox's PasswordChar prperty to an asterisk.
• If when the user clicks OK, both the username and password match (assume both are case sensitive), change the face to a smile. (The faces belong to the Wingding font.)
• If the username or password does not match, then change the face a frown.
• If the user changes the entry in either textbox, then change the face to the neutral face.
• If the user has attempted to logon and failed three times, then set the enabled property of the two textboxes and the button to false, so that they can no longer be acted upon.

Write a program that determines a student's class based on the number of credits they have earned (less than 24 freshman, greater than or equal to 24 but less than 54 sophomore, greater than or equal to 54 but less than 84 junior, greater than or equal to 84 senior).